Marina is a female teacher having an affair with a fellow teacher. The two indulge in dangerous extramarital sex in the classroom after school. The janitor, who was watching, threatens Marina and attacks her with an electric massager and a vibrator. Marina is disgusted by the dirty janitor, but before she knows it, she feels it. He then conspires with a bad student and rapes Marina over and over again. A violent orgy in the classroom late at night... A woman's sexuality gradually turns into a female.