The Anime Lad
Nine friends gather at school after hours and perform a paper charm meant to preserve their bond. The ritual instead strands them within a ruined elementary school outside normal reality. Separated across damaged corridors, they search for one another while the building demonstrates firm opposition to visitors.
Super Eyepatch Fox
A farewell gathering becomes a supernatural confinement when a friendship charm goes wrong. Nine students awaken inside a decaying school cut off from their own world. Broken passages divide the group. Hostile presences fill the silence. Escape requires understanding a place designed to keep them disoriented.
Gigguku
Corpse Party wastes no time turning familiar school architecture into a panic machine. A simple ritual drops nine friends into rotting classrooms where every blocked passage separates people who desperately need one another. The compressed OVA format keeps the pressure viciously high and the horror unapologetically graphic.
Father's Basement
Its violence can overwhelm its characters, and subtlety is nowhere on the timetable. The setting still works. A ruined school becomes a maze that splits friends apart and withholds reliable information. When the OVA slows down enough to let footsteps or empty rooms register, the atmosphere earns its ugliness.