A casual friendship ritual tears nine students into pieces across a school built on top of a mass grave. The OVA doesn't waste time on setup, it executes the premise with surgical precision, moving from "what is happening" to "oh god, what is happening" in minutes. The gore hits harder because the characters' confusion mirrors your own; you're not watching a supernatural problem get solved, you're watching kids realize too late that some mistakes can't be undone. This is horror that understands the worst part isn't the haunting, it's the moment you understand you caused it yourself.

Nine students stay at their high school on a rainy night after a festival to say goodbye to a friend, performing a ritual with small doll-shaped paper charms meant to keep them friends forever. What they don't know is that the charms are tied to Heavenly Host Academy, an elementary school torn down years ago after a string of gruesome murders, and it lies beneath the foundations of their own Kisaragi Academy. A sudden earthquake throws them into an alternate dimension haunted by vengeful ghosts from that bloody past. Separated and at the mercy of those spirits, they have to find each other and work together to escape before they are trapped with the dead forever. Corpse Party is a four-episode horror OVA that mixes gore, mystery and supernatural dread, with themes of redemption, sacrifice and a past that refuses to stay buried.