After murders and disappearances of several students and staff members, Heavenly Host Elementary School was torn down and abandoned. However, in modern day, a new high school has been built over it. One rainy night, after celebrating the school's culture festival, a few students decide to stay behind. After performing a ritual for a friendship charm, a sudden earthquake transports them to an alternate dimension where Heavenly Host still exists and is haunted by the ghosts of the school's murdered children. The students try to figure out the truth and mystery of the cursed school, in order to find their way home and survive the other shadowy forces that haunt the school.