Gakkou no Kaidan EP15 - The Devil's Spell – Rite of Darkness

Satsuki falls in with a bad crowd, or it might be better to say coven. Several girls at her school conspire to cast spells together, and she reluctantly joins in. But when one of them goes missing, and no one seems to remember the girl's very existence, Satsuki knows this isn't just any ordinary fad!