The story of the film begins after the events of the second season, at the graduation ceremony of the third-year students. Knowing that the graduation of the third-year members means the end of μ’s, the nine girls take a walk around the school filled with memories. However, when the students attempt to leave the school gates, a single email is sent to them, and the curtain on a new story for μ’s begins.

A beautiful schizophrenic woman is pushed over the edge by her husbands elicit affairs and when her hallucinations become reality the Devil comes to take his due. Is Miriam insane or has the Devil come to collect on her promise?