Gakkou no Kaidan (OVA)

When a seemingly ordinary schoolgirl stumbles upon an ancient, cursed artifact, her world is irrevocably changed. Suddenly thrust into a secret war against malevolent spirits and grotesque demons, she discovers a hidden legacy of magic and responsibility she never knew existed. With each new encounter, the lines between her mundane life and a terrifying supernatural reality blur, forcing her to confront horrors that defy explanation and challenge her understanding of good and evil. As the veil between worlds thins, she must master newfound powers and unravel a complex mystery to protect both her friends and the delicate balance of existence. This journey into the heart of darkness is fraught with peril, unexpected allies, and unsettling truths, promising a thrilling and often darkly humorous confrontation with the unknown.

✦ AI-drafted summary