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Each of the Seven Mysteries has its own boundary! The Natsucolla members are the Seven Mysteries! No. 1: The Three Clock Keepers - Noah Controls the "Present," "Future," and "Past"! A mystery that manipulates time. Boundary Location: On the stage in the hall! No. 2: Misaki Stairs - Hinako & Puchipuchi They will cut you with scissors and turn you into a doll! Don't step on the 4th step of the stairs in front of the art room! But only after school! Boundary Location: If you step on the 4th step, you'll be transported to a place where Japanese-style stairs continue forever! No. 3: Mirror Hell - Kazane A mystery that reflects the hearts of those in the mirror and turns them to darkness! Boundary Location: You can occasionally enter Mirror Hell through the mirror in the 3rd-floor girls' restroom! No. 4: Shijima of the Art Room - Tama Can trap things inside drawings! There is a way to escape! Boundary Location: The art room, inside the paintings. No. 5: The 4 PM Library - Mofu A special library in the back room of the science lab! The books reveal the future, present, and past of people who were at this school. Black books are for the dead. White books are for the living. You must never look at the red books. Boundary Location: The library. No. 6: The Reaper - Rimokon Searching for important secrets! Like a guardian of the boundaries! Boundary Location: At night, the school elevator area becomes the entrance to the boundary! No. 7: Hanako-san of the Toilet - Guest Carries a kitchen knife! Appears where the 3rd door of the 3rd-floor girls' restroom is! Boundary Location: 3rd-floor girls' restroom. The leader of the Seven Mysteries! No one except the Seven Mysteries themselves knows about their true nature.