The premise hooks you immediately: a guy inherits an all-girls school and walks into a missing student case, but the real intrigue is that nothing resolves the way you expect it to. By the final episode, you realize the mystery was never the point, the show was quietly building something stranger underneath, something about the school itself that refuses easy answers. It lingers because it commits to being incomplete, to leaving you with the unsettling feeling that you've only seen part of what was actually happening.
Kaihei inherits his late grandfather's position as chairman of St. Luminous Mission High School, an all-girls academy where he becomes the sole male student overnight. His new authority puts him in an awkward position: enforcing rules among classmates who resent his sudden elevation, while navigating the strange politics of an institution built entirely around female students. Then a girl vanishes without a trace. Trapped between protecting the school's reputation and uncovering the truth, Kaihei teams up with a small group of allies to investigate. They can't alert the authorities. They can't let the disappearance become public. What begins as a missing person case spirals into something far darker, revealing that St. Luminous harbors secrets buried long before Kaihei arrived. As graduation approaches, he realizes the school itself may be the real mystery. This is mystery-thriller material with psychological weight. It pulls you between the mundane stress of high school politics and creeping dread about what actually happened. Perfect for viewers who want their supernatural mystery grounded in genuine unease rather than spectacle.