Sachiko Shinozaki — the vengeful spirit responsible for countless deaths in and around Heavenly Host Elementary — is technically turning 7 again (death has paused her aging permanently). To celebrate, she grants her victims 24 hours of amnesty and invites them all to her birthday party, including many she has already killed. The theme is romantic comedy. The activities are twisted games designed purely for Sachiko's amusement. The outcome for the attendees is likely familiar.