Aogami High School collapsed in circumstances no one has fully explained. The accident reportedly involved many students and staff, a major earthquake was reported that the Japan Meteorological Agency never recorded, and the count of missing people does not match the student roster. You arrive for your first day as a new student, introduce yourself to your classmates and take your seat as they study you with interest. Recess is about to start, and the place seems like any ordinary high school. Aogami has its own ghost stories, though, and one of them warns that bad luck will follow if the new student is not treated well. The series is a supernatural horror mystery told across 24 online episodes.