Haruka Tachibana begins her tenure as a university lecturer, only to discover that Nurse Mamiya is using a supernatural flower—the manifestation of her deceased lover, Hiromi—to enslave students and staff. After Mamiya turns Mr. Oota into a servant and targets gymnasts Mai and Mizuki, Haruka must draw on her chemistry expertise to recreate a lethal solution and stop the parasitic plant from consuming the campus.