Yuko is seen as a strict teacher by those around her, but her true nature is that of a slut who loves young men. Behind the scenes, she has an affair with one of her students and enjoys an after-school affair. But one day, the student, looking for more excitement, asks to have a relationship with her at school. She tries to stop him, but her body responds to the techniques of her student, whose sex IQ has improved thanks to Yuko's training... She does her best to keep from letting out any sounds so that the people around her don't notice. Yuko climaxes in silence in a corner of the school.