Corpse Party OVA: The Curse of the Tortured Soul

Zhezhi and his good friends stayed at school to prepare for the cultural festival. The seven of them played a game of telling ghost stories. Soon the teacher came with Zhezhi's sister and urged them to go home. Before leaving, the squad leader, who likes ghost stories, suggested that they use spells to play "Happy Sachiko" to pray that the friendship between the seven of them would last forever and they would be together forever. However, when they finished the ceremony, something strange happened. The classroom suddenly shook violently. After a loud noise, the ground collapsed and everyone fell in. When they woke up, they found themselves in an old elementary school building. The doors and windows of this abandoned school were closed, making it scary and strange. Naomi found the unconscious Sayiko, and the two then acted together in an attempt to leave this terrible school building. But something more terrifying is waiting for them behind, and the victims appear one by one. In this ancient school called "Tenjin Elementary School", who is controlling all this...