Ritsuko (Riho Makise), who was killed by someone, is accused by Sara (Ayami Nakajo) of being 'disappointing.' In fact, it is clear that Ritsuko once died in an accident and was saved by Sara. Ritsuko, who was told by Sara that she couldn't resist the work she carried on her back, said, 'My life is not a mistake.' Then Sara proposes a detective game that revives Ritsuko and puts her life away. Ritsuko drinks the condition and begins to infer the criminal who killed her. The answer he arrived at was ...