Sixty years ago, a young woman was abandoned to die in an unoccupied school building behind Seikyou Academy. Despite little information about her passing, her spectral presence persists and haunts the location to this very day. As such, it's no surprise that one of Seikyou's school clubs has a focus on investigating the paranormal. The surprise, however, is that the club's founder is none other than Yuuko herself - the trapped ghost. In a state between life and death, Yuuko is reliant on Teiichi Niiya, a new student with the capacity to behold her. Teaming up with the club's unsuspecting participants, they delve into Seikyou's enigmas in search of the truth. Will learning the truth about Yuuko's fate provide her with solace, or lead the way for even more bizarre consequences for all involved?