Hibari wakes in an unfamiliar room with seven other girls. An announcement reaches them: only one person will leave this building alive. Exactly how many days pass before the first incident varies — but when someone dies in front of Hibari without her being able to stop it, she wishes, desperately, that she could go back to before it happened. The next morning, the person who died is alive at the breakfast table, the same as she was the day before. Hibari has the ability to turn back time. She can restart from any death as many times as she needs to. No one has to die. She intends to use this.