Ten years ago, in the middle of the night, a student fell to his death from the school's toilet window. Afterwards, "unbelievable incidents on campus" began to be staged one after another in this building. Women wandering alone in the corridor late at night, crying from the toilet cubicle. Sound... As the building was abandoned, it gradually became dusty.
Ten years later, after receiving a request from a mysterious client, the Supernatural Research Society came to this teaching building again. What happened back then, and can the final truth be found after ten years of exploration?