Shuuen no Shiori

At a school with a dark past, four students—A-ya, a boy who enjoys spreading rumors; B-ko, a well-liked girl who appears courteous; C-ta, a balanced friend of A-ya; and D-ne, a reserved girl—learn how to obtain the "Book of Demise," a collection of urban legends. They perform a ritual to access it, unknowingly entering the Demise Game. As they attempt to find a traitor among them to escape, the "Bookmark of Demise" begins making the stories in the book come true. These events are linked to a series of unexplained student murders that happened a decade earlier, causing the group to face a terrifying reality filled with deception and danger.