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.