Box: Hako no Naka ni Nanika Iru

Seven individuals received a puzzle and a ticket from an unknown source, leading them to a peculiar square house. A woman, drawn by curiosity, joined them. Inside, they encountered a girl as beautiful as a doll and a maze beyond their imagination. The group is unable to leave until they solve the puzzle. However, solving it comes with a cost—each solution causes a part of their body to vanish. The question remains: can they find a way out, and who was responsible for inviting them?