High-school student Sara Chidouin is walking home from school when she and her friend, Joe Tazuna, are kidnapped and trapped in a mysterious facility. They are then forced to compete in a "Death Game" in which the participants decide who dies by taking
majority votes in the "Main Game". With few other options, Sara and Joe follow the commands of their kidnappers and cooperate with the other characters present to explore the facility, survive the Death Game, and learn about their captors. Joe loses the first round of the Main Game and is violently executed. His death traumatizes and mentally destabilizes Sara, who begins to suffer from violent
hallucinations. On the third floor of the facility, the group learns that the organization responsible for the kidnappings produces lifelike dolls, some of which share appearances of the game's participants. They also have AIs of the main characters, which Sara can talk to. After a number of investigations and a concentrated effort to escape on behalf of the remaining participants in the Death Game, they are forced to play the Main Game once again, where Sara ends up with the tie-breaking vote. Sara can either double-cross the other survivors to escape with art student Nao Egokoro, resulting in an early ending, or vote for the executions of job-hopper Sou Hiyori or middle school student Kanna Kizuchi. In the latter two cases, after the Main Game, Sara encounters an AI version of Joe programmed by Sou. If she voted to kill Sou, the AI is benevolent, and encourages her to keep fighting, giving her closure and curing her of her hallucinations. If she voted to kill Kanna, the AI is malicious, and verbally abuses Sara to the point that she has a brief psychotic break,
completely forgets Joe, and begins to act more ruthlessly without the memory of his influence. Upon advancing to the next floor, Sara and the five remaining survivors encounter six dolls called the "Dummies": doll copies of participants who died in their first trials before meeting any other participants of the death game. During their exploration of this part of the facility, the group learns that the organization responsible for the Death Game is called ASU-NARO. One of the Dummies, Ranmaru Kageyama, suggests that he and Sara kill the entire party and escape together. If Kanna survived, Sara dismisses the idea outright; if Sou survived, Sara briefly entertains the idea, giving him the confidence to kill the surviving Yabusame sibling, and potentially being executed himself. Eventually, the party clears the floor, although at least five of the Dummies are destroyed in the process, leaving either baker Mai Tsurugi, salaryman Shunsuke Hayasaka, or boxer Naomichi Kurumada as the lone remaining Dummy. Sara and the remaining survivorsーformer police officer Keiji Shinogi, grade school student Gin Ibushi, and, dependent on previous decisions, either Sou; Kanna and punk musician Reko Yabusame; or Kanna and wrongfully convicted prisoner Alice Yabusame, advance to the final Main Game to confront the masterminds behind the Death Game. The story is under development as of December 2025, going up to Chapter 3, Part 1-B. ==Development and release==