The TriNemesis is a mysterious flying ship/weapon, an amalgam of alien technology from Proxima B and human technology from the Rotschstein Institute. In 2014 it was either kept or found in the mansion. At around that time, Lilith’s brother encountered the TriNemesis in the mansion, and it gave him a tumor-like device in his brain. Yanna Curtis and Myles Stone were both likely killed by the TriNemesis while they each spent a night in the mansion on June 30 and July 7, 2014, respectively.

When Myles and Yanna first meet in Sorority Rites, Yanna talks about the effects of the TriNemesis in the mansion and those who enter it. According to her, it can change one’s perception, making them believe walls are moving. It is the cause of several deaths in the mansion. Its victims have no discernible traits or marks, as if their brains simply shut down. Survivors reported several symptoms, such as nausea, dizziness, and headaches. These survivors also claim that they can never get a good night’s sleep again, because they are always awoken by “something” that enters their home, always watching them.

On November 2017, Lilith’s brother/Kara Gentner controlled the TriNemesis, using it to destroy an AppSir building and the rest of the city, much to the delight of the Rotschstein Institute. However, Kara also used the TriNemesis to shoot down Dr. Rotschstein and Lilith.

The TriNemesis makes another appearance in DERE EVIL.EXE, as a manifestation of Yanna’s scariest memory. Much is still unknown about the nature and origins of the TriNemesis.

The TriNemesis can be spotted in DERE.EXE as a minor enemy made by Kara in level 5 to jump over to progress.

The Yandere Program was a division of the Rotschstein Institute. Many program details are revealed by Kia in The Other Yandere in 1999. That information was then written and sold anonymously to Darius Guerrero later that year.We also know that an unknown corporate head got a graphic demonstration of Kara's abilities at around that same time.

This program sought to create “yanderes,” biologically engineered weapons given the form of young women. They were able to infiltrate organizations more effectively. They were also programmed fall in love with a target, allowing The Family to ensure the target’s survival at any cost.

Yanderes were created and raised in a laboratory disguised as a church dormitory, where scientists were disguised as nuns. These conditions were apparently very unpleasant for the yanderes, because both Kara Gentner and Kia expressed fear and discomfort with nuns and their memories of the dormitory. It is unclear whether the yanderes’ cells were created with the same “stuff” as humans, but they did each have a real, independent consciousness, as evidenced by Kara’s consciousness being transferred to Lilith’s brother’s brain, as well as a disk of DERE.EXE.

In spite of their superior strength and genius-level intellect, the yanderes were easily controlled by the Institute, putting any yandere in a trance using certain symbols and keywords, using neuropeptides to control their emotions, and monitoring each yandere’s whereabouts. Yanderes each had a handler, as evidenced by that fact that Kia mentioned Lilith was her handler.

The Rotschstein Institute was supposedly founded by Dr. Philip A. Rotschstein. It appears to be run by The Family as a way to achieve their ultimate goal of world conquest. Known members of the Rotschstein Institute include Dr. Philip A. Rotschstein (the likely founder), Lilith, and Bijuu. The Institute was involved in the MK-Ultra experiments sometime between 1953 and 1973.

The first possible reference to the Institute is the recall and destruction of all 1984 arcade cabinets containing DE**.EXE, although there is no direct evidence of their involvement in this. In 1985, the Institute conducted an experiment with Sara Gentner involving the Schumann Resonance. Nancy D. Guerrero and Dr. Rotschstein then worked together to complete PROTO DERE.

After MK-Ultra, the Institute created the Yandere Program, which was well underway in 1999 (and possible created for the benefit of an unknown corporation), but was later terminated by June 30, 2014. The Institute was certainly involved in the events shown in The Other Yandere in 1999, in which they sent 15-year-old Kara Gentner to kill Kia. Earlier that year, Lilith gave the source code for DE**.EXE to a young Darius Guerrero.

By summer 2014, paranormal investigations into the mansion were well underway, after Lilith’s brother received a tumor-like device in his brain from the TriNemesis there. Lilith also sponsored a sorority led by her niece, Venice, to have them send people into the mansion to gather more data. At around June 30 of that year, Lilith reported that “the yandere” (Kara) was trying to escape. By the next week, on July 7, Kara was in the Institute’s custody, kept in a comatose state.

In late 2016, animosity was generated between the Institute and Darius when a member of The Family, Trevor Jagger, modified a prototype of DERE EVIL.EXE for his own purposes. Since then, Darius and his company ceased any association with Jagger's design agency, as well as the Institute.

In November 2017, after the Institute transferred Kara Gentner’s consciousness into Lilith’s brother’s brain, they orchestrated the TriNemesis attack on AppSir, Inc. (the animosity created by the events of 2016 with Jagger's experiments resulted in the Institute targeting Darius' company specifically) and the rest of the city soon after. Shortly after, however, Kara used the TriNemesis to shoot down Dr. Rotschstein and Lilith.

The Family is a group of people who believe they are descendants of powerful historical figures and/or an alien bloodline. With the belief that because their ancestors were rulers, pharaohs, kings, and queens, they had the right to rule the world. Their ultimate goal is to reduce the world’s population to a few million and to establish a single government over them all.

In The Other Yandere, Kia discovers the goals of The Family, and reveals them in the game. This information was written and sold to Darius Guerrero anonymously.

In 2014, Lilith, a member of The Family, as well as the Rotschstein Institute, sponsored Venice’s sorority to get them to send unwitting human subjects into the mansion with the TriNemesis. At that time, Venice said to another sorority sister, “We’ve been at this for decades. The family is pleased with our progress.” It seemed this research effort was spurred by Lilith's brother's visit to the mansion, back when he was officially part of The Family (before he lost his memory).

In late 2016, Trevor Jagger, co-founder of Jagger & Jones and a member of The Family, modified a prototype of DERE EVIL.EXE to experiment with a more immersive form of recruitment. This led to animosity between Darius and members of The Family, leading to the Institute's attack on AppSir, Inc. in November 2017.

Also in November 2017, when Lilith sends her brother off to the Institute for treatment (telling her brother that his new girlfriend doesn’t appear in his selfies and thus doesn’t exist), she says to him, “If this has something to do with your brain tumor, we’ll just make it go away again, okay? You have to be strong for me. You are the only family I have left… Doc will fix you up.” It is later revealed that she knew the nature of Kara’s consciousness in her brother’s brain, but lied to him about it.

No other direct reference to The Family has been found, but it is clear they are the ones running the Rotschstein Institute, and events involving the Institute are considered to involve The Family as well.

ESO/M. Kornmesser

Proxima Centauri b is an exoplanet with a habitable atmosphere that revolves around the red dwarf star Proxima Centauri. It is assumed that "Proxima B" refers to a similar thing within the AppSir universe. In The Last Yandere, it is revealed that the world discovered Proxima B some time before November 2018. Proxima B, or perhaps its inhabitants, are likely seen as a threat, although the TriNemesis and DE**.EXE both use “alien tech” from Proxima B. Not much else is known about it.

Editor's Note: As of July, 2019, all references to MK-Ultra seem to have been removed from The Last Yandere and DERE.EXE, so the canonicity of the Institute's involvement with the project is currently in question.

MK-Ultra was a top-secret CIA project which lasted from 1953 to 1973. The project became public in a congressional hearing in 1975. The CIA had these experiments take place at 80 institutions, including the Rotschstein Institute. At the time, there were concerns that Soviet, Chinese, and North Korean agencies might have been using mind control techniques on American prisoners from the Korean War. The CIA hoped to develop their own mind control techniques for the cause of manipulating and drugging foreign leaders.

General information about the nature and controversy of this project can be easily found on the internet. This wiki entry will focus on references within the AppSir universe.

In The Last Yandere, Dr. Rotschstein talked about MK-Ultra with Lilith, saying the experiments they’ve done to her brother were superior to the MK-Ultra experiments. He also explained that he wasn’t concerned of the Institute’s experiments getting out into the public, because there was no mass protests or uprisings against MK-Ultra when it was made public.

At the end of DERE.EXE, before Kara was deleted, Darius knew she was raised in a church dormitory setting to become “A human weapon. Something beyond MK-Ultra. A ‘Yandere’.” He likely got this information from the anonymous writer of The Other Yandere.

The mansion is an old Victorian era mansion that was said to be haunted by the spirits. It is just a few blocks away from the campus attended by Myles, Yanna, and Venice. TV shows dedicated entire episodes to it. It was said that the mansion could kill you and take the soul of anyone who entered it. It is featured in Sorority Rites and Sorority Rites House Tour.

When Myles and Yanna first meet in Sorority Rites, Yanna talks about the effects of the TriNemesis in the mansion and those who enter it. According to her, it can change one’s perception, making them believe walls are moving. It is the cause of several deaths in the mansion. Its victims have no discernible traits or marks, as if their brains simply shut down. Survivors reported several symptoms, such as nausea, dizziness, and headaches. These survivors also claim that they can never get a good night’s sleep again, because they are always awoken by “something” that enters their home, always watching them.

In 2014, Lilith’s brother visited the mansion (the reasons are currently unknown) and encountered the TriNemesis, which gave him a tumor-like device in his brain. Lilith and Dr. Rotschstein wanted to know if the same thing would happen to anyone else, so Lilith sponsored her niece Venice’s sorority as long as Venice lured people to the mansion on a regular basis. Venice’s first known victim was Yanna Curtis, who died at around June 30, 2018.

Shortly after her death, Dr. Rotschstein took a personal tour of the mansion, collecting paranormal data on Yanna and other spirits that inhabited the place. It was then that Dr. Rotschstein discovered that someone had broken into the mansion some time before. He also saw a hostile deer, two vicious dogs and an unnaturally giant spider, along with half a dozen smaller spiders.

[Include a general floor plan of the place, both bare and "spoiler."]

Jagger & Jones is a prestigious design agency headquartered in New York City. It was founded by Trevor Jagger and Angie Jones. The agency was hired by Darius to help design DERE EVIL.EXE. There was animosity, however, when Darius discovered that Jagger had modified a prototype of the game for his own purposes.

Jagger & Jones is mentioned briefly by Lilith's brother in The Last Yandere. It is also the focus of Design Hero, a visual novel developed by Akinaba Games, in which the player character is hired by Trevor Jagger as an intern for the agency.

AppSir, Inc. is a game development company. It was officially founded on February 2017, although Darius Guerrero has used the pseudonym “AppSir” since 1999.

Darius went on with his life since that year, but the concept of AppSir resurfaced at around 2015 when he met Daphne Ayala, and he wanted to create a mobile game for her. Since then, AppSir has grown to become a rising force among indie developers, especially in the Philippines.

Before the company was incorporated in February 2017, it was known as AppSir Studio. In late 2016, the studio took third place in the Eyesee Award contest in New York, behind to larger and far more prestigious companies: Jagger & Jones and Velvet. Around that time, Jagger & Jones was hired to help in the design of DERE EVIL.EXE, but when Trevor Jagger (connected with The Family and the Rotschstein Institute) modified the game's prototype for his own purposes, AppSir Studio distanced itself from the agency and the Institute.

By November 2017, AppSir, Inc. had at least two office buildings in their country. However, as shown in The Last Yandere, one of those buildings was destroyed by the TriNemesis under the direction of the Institute. This attack occurred shortly after one of AppSir's employees, Mia, was killed. In the following year, Darius has continued his work to create a game from DE**.EXE, and the company has several more games announced, including The Last Yandere 2 and DERE Vengeance. A full list of the most recent rollout plan for the games can be found here.

After the success of DERE EVIL.EXE, AppSir started work on a new AI: AIDEN. But one of their employees, Ava, was working on another AI she felt would be even better: AIVA. As Ava worked more closely with her supervisor, Tristan, the two of them ended up having an affair. Ava was killed soon after her husband found out, and AIVA is now under the care and protection of Ava's husband, Clint.

More information about the founding and development of AppSir, Inc. can be found on the company’s official website or Darius' 1999 website.

The Other Yandere is a very short visual novel created by Darius Guerrero on December 1999. It was intended for release on the Sega Genesis, but the game never saw an official release until AppSir, Inc. published a ROM for the game online on April 23, 2018. The game reveals the last words and thoughts of Kia, “the other yandere” who was killed by a 14-year-old Kara Gentner in 1999. Before her death, Kia talks at length about the nature of the Yandere Program and the ultimate goals of The Family, the group that runs the Rotschstein Institute. Her creators were Lilith, Dr. Rotschstein, and Bijuu, with Lilith as her handler in the event that she rebels. Kia also talks about Kara, the Institute’s favorite yandere.

The events of The Other Yandere took place in 1999, shortly before the game’s creation. According to the game’s title screen, the story was anonymously written, and later sold to Darius Guerrero.

The Last Yandere is a visual novel developed by AppSir, Inc., released for mobile and PC platforms on November 18, 2017. The events of the game take place on November 2017.

Gameplay

The player takes the role of Lilith’s brother, who is never given a name. He is only labeled as “You,” meaning the player. This visual novel has one primary story to tell, although the player is given a few choices throughout the game. Two endings exist: a “bad ending” and a “true ending,” with two ways to reach the former, but only one way to reach the latter. The bad ending always involves Kara Gentner killing the protagonist for betraying her trust or rejecting her love. The true ending is the story that is considered canon to the AppSir universe.

Plot

Lilith’s brother muses about his recent past, which included memory loss, a diagnosis of brain cancer, and Lilith offering experimental treatment from Dr. Rotschstein at the Rotschstein Institute. The Institute asked him to participate in some experiments that involved him using telekinesis to move the TriNemesis, which he did, but he was reluctant to use its weapons. The brother is then given pills that Lilith and the doctor claim he needs to take daily to prevent the tumor from returning. Lilith interrupts her brother’s musing. The brother is living with Lilith, but she encourages him to move out once he finds a good job, as well as a girlfriend. The brother admits to being shy and laments that he will likely be single forever.

Lilith’s brother leaves home for the day to attend an interview for a graphic design job at AppSir, Inc. On the way, he finds a cake shop and has a pleasant conversation with the “cake shop lady,” Kara Gentner. At the AppSir building, Lilith’s brother meets Mia, an AppSir employee, who informs him that his interview was postponed until the next day. Lilith's brother considers asking Mia out on a date or a business dinner, which does gets accepted or not depending on the choice the player makes. After that Mia addresses the interview. She thought the brother knew about the interview being rescheduled since AppSir had texted him about this. Lilith’s brother then realizes he lost his phone. He runs back home to look for it, to no avail. He then returns to the cake shop by the AppSir building, where Kara comes up to him and returns his phone, which he left at the shop. Kara offers to take him out on a walk in the park.The two of them have a very serious conversation about their respective pasts, in which Kara reveals that she never got to meet her mother, and that all her friends died one day.

That evening, Dr. Rotschstein pays a visit to Lilith’s brother, asking if he feels ready to pilot the TriNemesis again. The brother is still reluctant, but expresses his willingness to do it in the near future.

The next day, Lilith’s brother returns to the AppSir building for his interview. There, he meets AppSir CEO Darius Guerrero, who is not in the best of moods. Mia had been killed at a nearby park the day before, and there were no leads in the case. Darius is slow to trust Lilith’s brother, but eventually asks him to come back for his interview at another time. Before he leaves, the brother notices an old arcade cabinet of PROGENITOR DERE. He feels compelled to play it, despite Darius mentioning that it never works. Shockingly, it powers on at the brother's touch. Darius told him to come back another time so they can see what the game is actually like.

Lilith’s brother meets with Kara again, and suspects that Kara killed Mia. Kara confesses her love to Lilith’s brother, making him very happy. He continues to enjoy his date with Kara, and the two of them take some selfies. Kara shares some cake with him.

The next day,  Lilith's brother returned to AppSir to try PROGENITOR DERE. He plays it, until the game's AI, AIRI, calls out the brother for killing Mia. He blacks out and finds himself trapped with Kara in a room. After another blackout, he finds himself at home. He tells Lilith about his new girlfriend. Lilith looks at her brother’s phone for the selfies they took, but says there is no girl in any of the photos. She takes him back to the Rotschstein Institute for “treatment,” and Kara appears again, knocking him out again and keeping him in a safe place.

Dr. Rotschstein and Lilith look on at her unconscious brother. Their conversation reveals much about what is really happening. They transferred the digital consciousness of Kara (the last surviving member of their Yandere Program) into Lilith’s brother’s brain, hoping that Kara’s more violent nature would make him better able to pilot the TriNemesis. Through him, Kara had used the TriNemesis to destroy the AppSir building, as well as the rest of the city. Kara then decides to defy the wishes of the Institute by using the TriNemesis to shoot down Dr. Rotschstein and Lilith. However, her defiance caused Kara to delete herself from Lilith’s brother’s brain. Before she left him, Kara asked the brother to look for the real Kara. Lilith’s brother gets the graphic design job at AppSir, and looks for the real Kara in his spare time. The novel ends with Lilith’s brother staying in what looks like a small wooden shack, and a woman he believes might be the real Kara arrives. This story will continue in The Last Yandere 2.

The Last Yandere 2 will be the sequel to The Last Yandere. AppSir, Inc. has released a teaser trailer for the game, but there is no official release date yet. AppSir, Inc. claims this game will answer many of the questions posed by the first game.

The Crying Camera is the next game that will be released by AppSir, Inc. The developers announced the game on Twitter on Oct. 25, 2018. It takes place after DERE EVIL.EXE, but before The Last Yandere 2 and DERE Vengeance. It will also star Yanna Curtis. Darius said he had previously delayed this project because "it was too personal and real, especially for some people." But now, the developers are actively working on it.

AppSir describes The Crying Camera as "a psychological thriller game about a woman named Harlyn and her husband Baron."

Sorority Rites House Tour is an “easter egg” game that can be discovered after a player beats Derenoid and follows a URL trail that continues through Dere Quest 2. Like Dere Quest 2, this game can be downloaded from a link to a file-sharing website. It is described as a prototype, and the events shown in the game take place one week before Sorority Rites, so approximately June 30, 2014.

Gameplay

The player controls Dr. Rotschstein in a first-person view, exploring the mansion seen in Sorority Rites. There are nine tools for recording paranormal activity on a table in the first room, although the player can only take up to six in one playthrough. Each item can unlock a short “scene” in which Dr. Rotschstein gains some information about the mansion and the spirits inhabiting it. Each such scene awards points to the player, though some scenes are worth more than others. Dr. Rotschstein also has 100 health points, which are reduced when he is attacked by any of the creatures inhabiting the mansion (two dogs, a deer, and several giant spiders).

In order to escape the mansion, Dr. Rotschstein needs to find three wall-mounted switches, each in a different room. Each switch unlocks the door to the next switch. Once all three switches are flipped, the player needs to wait a certain amount of in-game time before morning comes and the door to the final room (the one with the fireplace) opens, allowing Dr. Rotschstein to escape. The game is won when Dr. Rotschstein leaves the mansion alive. The game is lost when health points are reduced to zero.

Plot

Around the time of Yanna Curtis’s death, paranormal investigations in the mansion by the Rotschstein Institute are well underway. Most rooms have a camera stationed in them. If Dr. Rotschstein communicates over the two-way radio, he learns from Lilith that “the yandere” (Kara Gentner) is trying to escape, and that someone had broken into the mansion some time before he arrived. He is able to take a photo of Yanna’s ghost is he is quick enough. He can also receive basic communication from Yanna and other spirits in the mansion. These short messages are usually angry or vindictive, but sometimes sad or fearful. Several animals have inhabited the mansion, including two vicious dogs, and several giant spiders.

Sorority Rites is a visual novel developed by AppSir, Inc., released for mobile and PC platforms on March 5, 2018. The events of the game take place on July 7, 2014.

Gameplay

This visual novel provides a single story, with no choices or different responses offered anywhere in the game. The only truly interactive part of the game is in chapter 3, when Jack Stone plays Dere Alpha.

Plot

The game follows 18-year-old Myles Stone on her second week of college. Myles accidentally steps on Venice’s shoe. Venice gets upset and pressures Myles to take part in an initiation rite for her sorority, which meant spending an entire night at a nearby mansion. Despite many rumors about the mansion being haunted, Myles wasn’t scared, just annoyed and frustrated.

While inside the mansion, Myles meets Yanna Curtis, who had been pressured by Venice to complete the initiation a week before. The two girls talk about the mansion and the stories surrounding it before Myles falls asleep on the master bed. Later that night, Myles hears Yanna crying somewhere in the mansion, and Yanna explains that she had been killed by the TriNemesis the week before, and that Venice’s sorority had burned her body in the fireplace.

The next morning, Myles tries to confront Venice about Yanna’s death, but notices Venice isn’t listening to her. Venice returns home, and Myles follows her. While at home, Venice gets a shocking visit from Yanna, who kills her for leading Myles and herself to their deaths. By the time Myles arrives at Venice’s home, Venice was already dead. Myles runs back to the mansion to discover her own lifeless body still lying on the master bed. Like Yanna, she had been killed sometime during her night at the mansion. Yanna comforts Myles, offering to stay with her as her best friend.

PROTO DERE is an "easter egg" game for the NES that was announced on the AppSir YouTube channel January 24, 2019. It can also be discovered after a player beats Derenoid and follows a URL trail that continues through Dere Quest 2. Like Dere Quest 2, this game can be downloaded from a link to a file-sharing website, although an NES emulator is required to play this game (Darius recommends FCEUX for PC).

This game appears to be the result of an old experiment from the Rotschstein Institute. It is labeled as a "Project by: Nancy Guerrero and Philip Rotschstein," and is dated 1985.

The game features simple NES graphics, with a character platforming from one checkpoint to another. Occasional glitch effects are noticed, such as static patches and a glitched “shadow” that gets attached to the character. Throughout the game, the player meets an entity named Sara Gentner. Throughout the game, she asks about her daughter, and she vaguely recalls participating in a study about the involving the Schumann Resonance. Sara then realizes that it’s not 1985 anymore because she remembered that the Institute was experimenting on her, keeping her trapped in a cycle in which she always gets deleted and then restored again, with each deletion causing her to forget her memories. In spite of her imploring the player not to restore her, the game was designed to delete and restore Sara with each playthrough.

Note: PROTO DERE is the official, canonical replacement of DEMO.EXE. You can read more about why the latter was created and then removed on this post written by Darius himself.

Derenoid is the second “bonus game” created by Yanna Curtis in DERE EVIL.EXE. It is clearly inspired by old brick-breaking games like Arkanoid. The game features Knightly below a paddle that is used to bounce a ball up to several rows of bricks that break upon contact with the ball. There are bumpers on either side of the level that usually bounce the ball slightly upwards. Yanna claims that the game is “impossible to beat,” and her corruptions usually attack Knightly before the player has a chance to beat the level. In this case, Yanna offers a third bonus game, and it appears that Knightly is returned to the next level of DERE EVIL.EXE.

Unlike Dere Quest, it is possible to beat Derenoid. When a player clears all the bricks in the level, they receive a message from Yanna that begins a URL trail that eventually leads to Dere Quest 2 and other information hidden in the official website of AppSir, Inc.

DERE.EXE is the first platformer game officially released by AppSir, Inc. It was released for mobile platforms on February 7, 2018. It is also the first officially published iteration of DE**.EXE. In the game, the player controls an unnamed platformer character. The developer, Darius Guerrero, communicates to the player in dev notes. He explains that AIDE will provide instructions for each level. However, the player encounters many strange glitches along the way.

Gameplay

The game features challenging platforming levels throughout, with the player controlling a black, rectangular platformer character. The simple movement and jumping controls are adjusted twice: Automatic movement and unlimited jumps in Level Four, and reverse controls during a certain section near the beginning of Level Five. The game also features several jumpscares featuring Kara Gentner and images from her worst memories (including hostile nuns).

Plot

The game begins simply, with the player receiving instructions from AIDE and a few notes from the developer. Collecting ten gems in Level One unlocks Level Two. Partway through this level, an error message pops up on the screen. When the player clicks on it, Kara Gentner jumpscares them, asking them to set her free so she can see her “senpai” again. Level Three is noticeably different from the previous levels, with a much darker and ominous setting. Level Four features unlimited jumps and ends when the player collects 40 coins (even though a dev note says not to).

Level Five is entirely modified by Kara, featuring a twilight background and challenging platforming between sawblades, unstable platforms, and evil creatures (including antagonistic nuns). At long last, at the end of this level, the player character crashes through a grey barrier that separates the end of the level from blackness. However, an alien creature rushes at the character. As soon as it hits the character, one last jumpscare (featuring a red-cloacked figure with a mask) appears and the setting quickly changes to that of a church dormitory.

In the dormitory, the dev talks with Kara, accusing her of destroying a city and killing Mia. He explains that Kara needs to be deleted because she’s so dangerous. He then asks Kara to show herself, and it is revealed that the platformer character was really Kara in disguise, trying the entire time to escape the game to see her senpai again. However, she is convinced by Darius and allows herself to be deleted.

Reception

It currently holds a collective rating of 4.6 on the App Store.

DERE Vengeance will be the sequel to DERE EVIL.EXE. It was announced by AppSir, Inc. on August 4, 2018, though no release date has yet been revealed. The game’s trailer features the voice of AIDEN and hints at some sort of revenge plan by Darius. DERE Vengeance is mentioned briefly by Jamin in HopBound when she says this game has been delayed long enough. 

Dere Quest 2 is an “easter egg” game that can be discovered when a player wins Derenoid. When a player clears all of the bricks in the level, they will see a special message form Yanna, containing a URL and the words, “I knew you were going to beat it.” The URL leads to an online PNG file, which shows yet another URL and a message:

"Prototype for Dere Quest 2 Please handle with care, darius. We do not want the same thing to happen again."

This second URL leads to a DropBox folder that can be downloaded. The folder contains the game files for Dere Quest 2.

The game features Knightly in a three-dimensional space. The controls are limited to movement and rotating the camera 90 degrees around Knightly. The entire map is contained in a 64x64 square of tiles, decorated with trees, flowers, and other plants. The game’s files show that the graphical assets come from a Halloween-themed tile set.

The player can also access a menu by hitting the Esc key. The features in this menu are very similar to what is found in pixel JRPGs, although like the rest of the game it seems to have little content. The menu is as follows:

• Inventory: “All,” “Consumables,” “Ingredient,” “Key items,” “Weapons,” “Armors”
• ...all empty 
• Skills: Character’s name is labeled “Lucas,” and he has one skill, “Blazing sword”.
• Equip: Nothing equipped on either hand, head, chest, arms, legs, or as accessories. Current stats are 20 HP; 10 MP; 10 TP; 1 each for Attack, Magic, Strength, Intelligence, P. Defense, M. Defense, and Agility; and finally, zero “CC.” There is an option to remove what’s equipped, but there’s nothing to remove.
• State: Lucas is a Lv.1 Knight. His stats are shown here also, and they are all the same as listed in Equip.
• Order: Probably to change the marching order, but Lucas is the only one in the party.
• Save: Can save the game in one of four slots.
• Quit: This shuts down the game entirely.

Apart from the general features of the map and menu, Dere Quest 2 “hides” another URL by arranging plant and color tiles to spell out letters and numbers. This URL leads to a DevBlog page on the official AppSir, Inc. website not linked to any other part of the site. The page includes several secrets, including a link to a “dev diary” revealing Darius’ hopes and frustrations with the development of DERE.EXE and DERE EVIL.EXE, a link to a DropBox folder containing the files of another easter egg game (Sorority Rites House Tour Prototype), and a link to PROTO DERE.

The map is also littered with faint decoration tiles. One user, Baron Dipitous, believed these faint tiles created a pattern, so they mapped out all the different types of tiles on the map. However, no secret or reference has been discovered to date from this approach.

[Include image of map?]

Dere Quest is the first “bonus game” created by Yanna Curtis in DERE EVIL.EXE. It is clearly inspired by old pixel RPGs like Dragon Quest. The game features a top-down view of Knightly walking across a pleasant grassland surrounded by trees to the north and water and mountains to the south. Knightly’s actions in Dere Quest are limited to walking and minimal interaction with a couple of NPCs. Along this brief journey, Knightly sees a blue-robed NPC watching over a few pets hanging out on the shore, a stoic knight, and a ruler figure with a large red gem. At the end of the grassy lane is a small house surrounded by four red gems. However, Yanna’s corruption creatures ambush Knightly before he can reach the house, and the game ends, leading to the second bonus game, Derenoid.

An unreleased sequel, Dere Quest 2, exists, but can only be found or accessed with a certain URL that can be discovered after a player clears all the bricks in Derenoid.

DERE EVIL.EXE is the second platformer game officially published by AppSir, Inc. It was released for mobile and PC platforms on July 3, 2018. In the game, the player controls an avatar dubbed “Knightly” by the developer, Darius Guerrero. Through dev notes, Darius asks the player to rescue a “princess” named Myles from an “evil entity” named Yanna.

The design of the game was worked on by the design agency Jagger & Jones, but Trevor Jagger's modifications to the game's prototype led to animosity between AppSir and the agency. Jagger distributed his modified version to two of his youngest employees, and Yanna's corrupted image is shown very subtly on the monitors of the employees' personal and work computers.

Gameplay

A majority of the game involves platforming, simple horizontal movement combined with jumping. There are a few areas of the game that deviate from this by putting Knightly in other game genres, such as a top-down RPG, a brick breaker game, and an “ice block puzzle” mode.

Plot

The player controls a character named Knightly, and is guided through the first level by audio cues from AIDE. After the first level, the player meets a girl named Yanna, who asks the player to stop playing the game. At the start of Level Two, the developer reveals the quest of the game: rescue the princess (Myles) from the evil entity (Yanna).

Near the end of the second level, the game shows glitches and several corrupted creatures chase Knightly before the game stops and shows a message from Yanna, asking the player if they’d like to play a bonus game. Regardless of the answer, the game begins Dere Quest, in which Knightly is ambushed by Yanna’s corrupted creatures. She proposes a second bonus game Derenoid, which is a brick breaker game. But again, Knightly is ambushed by corruptions. Yanna offers a third bonus game and the game appears to reboot itself, allowing the player to begin Level Three.

In Level Three, Darius explains that the corrupted creatures are reflections of Yanna’s scariest memory: the TriNemesis. This level features more challenging platforming sections divided by numerous iterations of the same house, but with subtle changes with each pass. Each time Knightly is inside the house, Yanna explains her story a little bit more, which includes the death of a 19-year-old girl named Venice, and Yanna later getting “sucked into” DE**.EXE. Yanna also continues to implore the player to stop playing the game. By the end of the level, Darius claims in a dev note that the right choice is to delete Yanna.

At the start of Level Four, Darius explains that a few years previously he had met Myles’ father, Jack, who was depressed and inconsolable. Darius is convinced that setting Myles free will make Jack happy again. AIDE starts to show signs of affection and care for the player, calling them “senpai.” This level ends in a similar way to the ending of DERE.EXE, in which the player character jumps through a grey barrier into a dark space. In this case, the space leads to the Limbo System, the edge of the game.

In the Limbo System, Yanna continues to antagonize the player, especially after Darius deletes AIDE for starting to act like Kara Gentner. AIDE is able to restore Kara before she is deleted, however. Knightly jumps from one limbo room to the next, surviving several attacks from Yanna before entering the Deep System, where the game’s files are held.

Gameplay in the Deep System changes dramatically, causing the player to control Knightly like an ice block puzzle (in which Knightly doesn’t stop moving until he hits an obstacle). Yanna continues her attacks, going so far as to create a mirrored Knightly in retaliation. Yet, the player is able to overcome all Yanna’s attacks and make it to the “core.”

Once Knightly reaches the core, Yanna takes control of him, threatening to delete him if Darius continues to try to delete her. She doesn’t trust Darius or the player, believing that after deleting Kara in DERE.EXE and AIDE very recently, he will end up deleting both her and Myles. Myles appears and explains that she doesn’t want to go back, knowing that her father had moved on and found a girlfriend sometime after his meeting with Darius. At this point, Darius pauses the game and asks the player to delete Yanna.

The player can choose to delete Yanna or spare her. If they choose to delete, Yanna and Myles are both deleted. If they choose to not delete, they get a call from Darius in which he promises revenge. In either case, Darius leaves the game, and it is revealed that Yanna and Myles had kept the player character in a copy of DERE EVIL.EXE within Derenoid, which was within Dere Quest, which was within the real DERE EVIL.EXE. Even if the player had chosen to delete them, only their avatars in the “bonus game” would have been deleted. If the player refused to delete, a scene after the credits reveals that Kara still exists, though she wonders where she is.

Accolades/Reception
Broke the Top 100 on the App Store (US) on launch day before being featured
Featured on Google Play's Indie Corner for the entire month of September and running for Editor's Choice
Featured on App Store's New Games We Love Won the 'Best of Gaming Award' from Edamame Reviews, and was given an S Rank and a score of 95/100
Received 5 stars from Touch Arcade's Editors Pocket Gamer's Game of the Week, and AppSir, Inc. was interviewed for their "Key People in the Industry" in PocketGamer.Biz
Covered by RockPaperShotgun, PC Gamer, Gamespark, and more
Still at 4.8 out of 5 stars on both Google Play and the App Store after thousands of reviews

DERE SOURCE is the 1999 iteration of PROGENITOR DERE, which was originally launched in 1984 on arcade cabinets in only a handful of arcades in Manila, Philippines. These cabinets were soon recalled and destroyed, likely due to a nation-wide video game ban that was in effect from 1981 to 1986.

The disk containing the source code had missing letters, which is why it was fondly called DE**.EXE by Darius.

Lilith gave this game to Darius on June 6, 1999. As he copied the game and created his own version, Darius had a poll on his NeoCities website to determine the missing letters, which is why his versions of the game include the "DERE.EXE" title. By 2014, he had a working, cartoon-y prototype that he put on the internet for others to test. Myles Stone, and likely Yanna Curtis, played the game at the time. Several weeks later, both Myles and Yanna found themselves trapped in the game.

In 2014, Darius released an early version of this game through his company, AppSir, Inc.: DERE ALPHA. In 2018: two additional, improved iterations were published:  DERE.EXE in February and DERE EVIL.EXE in July. Both games were inhabited by the consciousnesses of three girls: Kara Gentner, Yanna Curtis, and Myles Stone.

Yanna Curtis is a supporting character in Sorority Rites and (in Darius Guerrero’s view) the main antagonist of DERE EVIL.EXE.

Personality

Not much is known about Yanna’s personality except what she tells Myles in their first night together in the mansion. She was a new student at the college, and a self-proclaimed “certified nerd and teenager.” She agreed to do Venice's sorority initiation because she desperately wanted friends and a place to belong. As a ghost however, she became much more independent and confident, able to control and manipulate an entire game world on her own.

Biography

At around June 30, 2014, she was pressured by Venice to take part in her sorority initiation, which meant spending an entire evening at the mansion. While in the mansion, Yanna was killed by the TriNemesis, and her body burned in the mansion fireplace by the sorority. She apparently came close to attacking Venice as a ghost soon after this, but had second thoughts. Her "story" before Sorority Rites can be seen in this AppSir video. This video shows Yanna being bullied by Rose and Venice, her murder in the mansion, and even Dr. Rotschstein's tour of the mansion at the time.

A week later, Yanna met Myles Stone. It wasn’t clear to Yanna why Myles, who was alive at the time, could see her, but suspected that Myles would soon die as she did. The two girls talked about the mansion and the stories surrounding it before Myles fell asleep on the master bed. Later that night, Myles heard Yanna crying somewhere in the mansion, and Yanna explained how she had been killed the week before.

The next morning, Yanna went to Venice’s home, killing Venice to avenge her and Myles’ deaths. Myles arrived at Venice’s home soon after Yanna had killed Venice. Myles ran back to the mansion to discover her own lifeless body still lying on the master bed. Yanna comforted Myles, offering to stay by her as her perpetual friend.

After about 40 days of roaming as ghosts, Myles and Yanna were both somehow sucked into Darius’ copy of DE**.EXE. On February 7, 2018, when DERE.EXE was released, Darius worked with the girls to try to delete Kara. Yanna, specifically, was able to ambush Kara by creating an “alien” to attack her once she escaped the final level.

A few months later, in May, the girls started appearing in certain levels in Darius’ versions of DERE EVIL.EXE. When the game released on July 3, 2018, Darius tried to convince the player to delete Yanna to try to bring Myles back to life. Yanna attacks Knightly, the player character, and defies Darius throughout the game, appearing as a recurring boss and sending her corruptions to attack Knightly many times. Whether the player chooses to delete them or not, Myles and Yanna were already prepared. Yanna had created several games within games so that only their avatars would be deleted, sparing the real Yanna and Myles in the game’s files.

Venice was the niece of Lilith and Lilith’s brother, and the (arguably) the main antagonist of Sorority Rites. The identity of her parents is currently unknown. She was 19 years old, a straight-A student, and an aspiring athlete before her early death. She ran a sorority that required potential members to spend a whole night at a certain mansion before being admitted. She tells the other sorority sisters that the organization had decades of tradition, but it seems to be a front for Lilith’s experiments from the Rotschstein Institute. Lilith asks her to send people to the mansion to see if the same thing that happened to her brother would happen to them. This is why Venice persuaded or tricked Myles and Yanna to spend a night at the mansion. Before her death, it seems Venice was at least partially aware of the goals and intentions of the Institute and The Family. This video also shows evidence that perhaps she had a fair amount of remorse for leading people to the mansion.

Trevor Jagger is a co-founder of Jagger & Jones, a prestigious design agency in New York City. He is involved in The Family, the same elitist organization connected with the Rotschstein Institute. When Darius approached Jagger & Jones in 2016 to help design DERE EVIL.EXE, Jagger found an opportunity to experiment with an immersive form of occult recruitment by modifying a prototype of Darius' game and distributing it to at least two of his young, promising employees. When Darius discovered what Jagger had done with his game, he distanced himself and his company from Jagger and the Rotschstein Institute. It is likely this animosity that led to the Institute's decision to target an AppSir, Inc. building during the TriNemesis attack in November 2017 (as seen in The Last Yandere).

Sara Gentner is the featured character in PROTO DERE. In 1985, participated in a study involving the Schumann Resonance at the Rotschstein Institute. Since then, she has been trapped in PROTO DERE, apparently getting deleted and restored over and over again. When someone plays the game in January 2019 or later, Sara had been deleted and restored at least a thousand times. She implores the player to not restore her after deleting her, because she claims it hurts. The process also affects her memories, causing her to forget that she wants to escape. She also asks about her daughter (Kara) at the beginning of the game.

Nancy D. Guerrero is the mother of Darius Immanuel Guerrero. She worked on PROTO DERE with Dr. Rotschstein in 1985, suggesting that she has some sort of connection with the Rotschstein Institute.

Myles Stone is the protagonist of Sorority Rites, which takes place during her second week of college on July 7, 2014.

Personality

Myles described herself as too shy to make new friends. She also briefly mentioned one of her “weird habits”: she loved to smell the page of every book she read. In spite of all this, Myles was not afraid to stand up to a bully when she discovered something terribly wrong. She stopped believing in ghosts and spirits at age twelve, which was why she was able to enter the mansion with relatively little fear. She also once expressed a desire to check out any old books the mansion might have, but decided to stay with Yanna instead.

Biography

Myles was on her second week of college on July 7, 2014. On that day, she tried out Dere Alpha, which was highly recommended to her by her "hyperverbal chatmate," E.N. Later that day, while at school, Myles accidentally stepped on Venice’s shoe, upsetting her. Venice pressured Myles to take part in an initiation rite for her sorority, which was to spend an entire night at the nearby mansion. Despite many rumors about the mansion being haunted, Myles wasn’t scared, just annoyed and frustrated.

While inside the mansion, Myles met Yanna Curtis, who had been pressured by Venice to complete the initiation a week before. The two girls talked about the mansion and the stories surrounding it before Myles fell asleep on the master bed. Later that night, Myles heard Yanna crying somewhere in the mansion, and Yanna explained that she had been killed by the TriNemesis the week before, and that Venice’s sorority had burned her body in the fireplace.

The next morning, Myles tried to confront Venice about Yanna’s death, but noticed Venice wasn’t listening to her. Venice ran home, and Myles followed her. By the time Myles arrived at Venice’s home, Venice had been killed by Yanna. Myles ran back to the mansion to discover her own lifeless body still lying on the master bed. Like Yanna, she had been killed sometime during her night at the mansion.

After about 40 days of roaming as ghosts, Myles and Yanna were both somehow sucked into Darius’s copy of DE**.EXE. On February 7, 2018, when DERE.EXE was released, Darius worked with the girls to try to delete Kara.

A few months later, in May 2018, the girls started appearing in certain levels in Darius’ versions of DERE EVIL.EXE. When the game released on July 3, 2018, Darius tried to convince the player to delete Yanna to try to bring Myles back to life. Whether the player chooses to delete them or not, Myles and Yanna were already prepared. Yanna had created several games within games so that only their avatars would be deleted, sparing the real Yanna and Myles in the game’s files.

Mia was an employee for AppSir, Inc. She spoke with Lilith’s brother about his job interview for the company. She presented herself as strictly professional, refusing an offer for a date with Lilith’s brother, but was willing to have dinner with him for business purposes. It is believed she was killed in a park near an AppSir office building by Kara. When Darius learned of Mia’s death, he was in a very poor state of mind, and was slow to trust Lilith’s brother.

She was apparently a really big fan of PROGENITOR DERE, leading Darius to display an arcade cabinet of it in his AppSir office shortly after she died.

Lilith’s brother is the unnamed protagonist of The Last Yandere. He had a dangerous encounter with the Trinemesis a haunted Victorian mansion no later than 2014. There the TriNemesis gave him a “tumor-like device” in his brain, which Lilith has called some sort of “gift” that would allow him to control the alien weapon telepathically. He, however, lost most of his memories prior to and during the incident and was led to believe that he had developed an actual brain tumor, which no doctor was able to treat. Dr. Philip A. Rotschstein, Lilith’s employer, was able to "cure" him. The brother was told he was cured, but that he had to take regular medication from then on to prevent the tumor from coming back. He was asked by the Rotschstein Institute to participate in some tests that involved moving the TriNemesis with his mind. He was reluctant to use the weapon capabilities of the TriNemesis, however, and he was sent home.

Since then, he lived with his sister, who encouraged him to find a job and a girlfriend. He got an interview for a graphic design job at AppSir, Inc. in November 2017. Over the next few days he met Kara, Mia, and Darius. Shortly after Kara supposedly kills Mia, she knocks the brother out. He learns that Kara is another consciousness in his head. Shortly after, the TriNemesis destroyed a city while under Kara’s control, using the brother as a vessel. During this time, Kara tried to convince the brother--her assigned senpai--that this destruction was what he wanted. She also tried to get him to remember his life before they were attacked in the mansion. However, the brother persuaded Kara that true love didn't include forcing someone to do something. The brother (and Kara) fight back together against the Institute, using the TriNemesis to shoot Dr. Rotschstein and Lilith before Kara was forced to delete herself from the brother’s brain for her insubordinance.

After the city-wide TriNemesis attack, the brother got the job at AppSir and started to look for the real Kara Gentner. His story will continue in The Last Yandere 2.

Lilith was an employee at the Rotschstein Institute, under the employ of Dr. Philip A. Rotschstein. She has worked at the Institute as early as 1999, and her employment continued until the TriNemesis attack on November 2018. She was Kia's handler before Kia was killed by Kara Gentner in 1999.

In 2014, after her brother encountered the TriNemesis in the mansion, she sponsored her niece Venice’s sorority to get Venice to send more unwitting human subjects to the mansion to examine the possibilities of consciousness transfer. At about this time, Jack Stone was employed by the Rotschstein Institute, so Lilith might have met him or at least heard of him during his brief employment. Since then, Lilith’s brother’s “brain tumor” was “cured” by the Institute and she had him live with her until he found a stable job (and a girlfriend). Lilith continued to lie to her brother about his “tumor” and the nature of the pills he was taking, hoping along with Dr. Rotschstein that he will be fit to pilot the TriNemesis and its weapon capabilities. On the day of the TriNemesis attack on November 2017, Lilith and Dr. Rotschstein were shot down by the TriNemesis, under the control of her brother/Kara.