At school, she is a strict teacher. After school, she is a lewd woman who indulges in affairs with her students. Chisato has two faces. But recently, her student and lover, Kato, has begun to ask for a relationship even at school, and the balance between these two faces is becoming unstable. In the classroom. In the bathroom. In the staff room. No matter how much she tries to persuade him, Kato won't listen. If she is found out, her teaching career will be over. Chisato desperately tries to hold back from making any noise so that she won't be found out. But the more she holds back, the greater the sense of immorality grows, and eventually it even consumes Chisato's reason...