Yuudai Akatsuki, 17 years old and a student at Kisaragi Academy class 2-9. Staying after school with his friends, he didn't think anything is going to happen. After a earthquake, Yuudai finds himself trap in a deadly place called Heavenly Host Elementary School. What kind of connection is there between this place of horrors, and his forgotten past. Rated M for the 'good' stuff.