Kisaragi Academy has just concluded its annual cultural festival. Naomi Nakajima (Rina Ikoma) and childhood sweetheart Tetsuo Mochida (Ryosuke Ikeoka) are still in the classroom. They are reluctant to leave and want to stay in school for a while longer. At this time, a thunderclap suddenly sounded, scaring everyone to plug their ears, and the switch seemed to have a problem. The supernatural girl Ayumi Shinozaki (Nozomi Maeda) found the candles used in the haunted house, so she suggested playing the supernatural game of "Happy Sachiko". Kisaragi Academy was formerly Tenjin Elementary School, where a terrible incident occurred. At the beginning, a health teacher fell down the stairs and died, and two students were killed, and the school became terrifying. Although the legend of "Happy Sachiko" is that it can summon happiness, after everyone played it, they fell into an isolated waste gas school building, and terrible stories were staged one after another... This film is adapted from the game of the same name.