Aogami High School collapsed due to undetermined circumstances. Several details of the accident remain mysterious, including reported involvement by numerous students and staff members, a reported large earthquake occurring but not registered in the records of the Japan Meteorological Agency, and the number of missing persons not matching the student list.

Your first day at a new school.

You have just finished greeting your classmates and are seated in front of them, taking a curious look.

Class is almost over and recess is about to begin.

One of them is that "if you don't treat the new student well, bad luck will happen". And then...

(Source: Official Site, Translated)