Box: Hako no Naka ni Nanika Iru

Seven individuals each receive an enigmatic puzzle and a ticket from an anonymous sender. Following the instructions on their tickets, they are led to a bizarre, square-shaped house. Upon arrival, they are unexpectedly joined by a mysterious woman who claims she simply came out of curiosity. Together, this unlikely group steps inside, only to discover that the interior holds far more than they ever anticipated. Waiting for them within the strange structure is a girl as flawlessly beautiful as a porcelain doll, along with an unimaginably complex maze that defies all logic. Trapped within this surreal environment, the group quickly learns the terrifying rules of their confinement: escape is impossible unless they successfully solve the puzzles before them. However, victory comes at a horrifying price. Each time a puzzle is completed, a portion of the solver's physical body vanishes entirely. Caught between the desperate need to flee and the gruesome cost of progression, the captives must navigate both the labyrinth and their own mounting dread. As they struggle to survive, two haunting questions linger in the air—will any of them manage to escape intact, and who exactly orchestrated this nightmarish invitation?