One day, a mother catches her son (Tooru) masturbating while watching AV. Knowing that her son struggles to get along with women, the mother tries to build his immunity to women using her own body. However, she becomes worried about the clumsiness of her son's caresses and sex, which are based solely on AV knowledge. From then on, the mother begins sex education with her son... As they repeatedly unite their bodies, the son gradually improves…
