After celebrating their school's cultural festival, a group of students are telling ghost stories when their class representative, Nakashima Naomi, decides to perform a charm called "Sachiko Ever After" which would allow them to remain friends for eternity. But instead something goes wrong with the charm and a sudden earthquake transports them to an alternate dimension where Heavenly Host, an elementary school that was torn down followed by the murders and disappearances of several of its staff and students, 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 shadowy forces that haunt the school.

imdb:tt4530804