Eriko is a mother who lives with her son who wants to become a doctor. One day, her son comes home from school feeling depressed. When she asks him about the situation, he tells her that in order to become a doctor, he asked girls at school to let him touch their bodies, but they rejected him... Her innocent son has come up against a wall called sex... Seeing her son feeling depressed that he can't become a doctor, Eriko uses her own body to teach him about sex.