Shuuen no Shiori

A group of four individuals becomes entangled in a deadly game triggered by a mysterious object known as the "Bookmark of Demise," which was supposedly recovered from ten years ago. The game, initiated by a traitor, requires participants to follow specific rules and complete various urban legend-inspired tasks, such as One-Man Hide and Seek and Mearry-san's Messages. Failure to comply with the demands outlined in a strange letter results in death. The players must navigate challenges like Doppelgangers and the Monkey's Hand to survive and reach the end.