Sachiko was a female teacher and also a sexual slave to a certain student. Her affair with a colleague was discovered by a student, and she was demanded to exchange her body for not revealing the truth. Sachiko had no choice but to succumb to the threats, as she couldn't afford to lose her teaching position. However, the student's demands gradually escalated. Orders for physical service were given in the school toilets, in the classroom, and even when other students were nearby. If she refused, everything would end. If she made a sound and was discovered, everything would end. Sachiko could only endure, trembling with humiliation.
