Mizusaki is a female exercise teacher who is very much respected by students and colleagues, her life seems to be very beautiful and stable, suddenly from where she appeared from her colleague with her nude pictures in his phone. Unfortunately, when he was an extremely perverted guy, he made a suggestion that if she wanted to delete these pictures, they had to agree to voluntarily have sex with him right in the classroom. Because she wanted to keep the honor and her current work, she also reluctantly accepted this very miserable offer.