While Mayuko plays the role of a strict teacher on the surface, her true nature is that of a lewd woman who secretly has affairs with her students and indulges in pleasure. Recently, she has been having affairs with Yamada, a student of hers, in blind spots at school, enjoying the thrill and sense of immorality. However, the situation changes when Kawatani, a classmate, witnesses them. If discovered, he will find out her secret, which could end her teaching career, and when he tells her, "If you don't want me to tell anyone, do the same to me," she has no choice but to offer her body obediently. However, the hot-blooded young man's demands are escalating...