Bintaro, the younger brother, distrusts women due to being bullied by his older sister (Sayuri) in the past. As an adult, he never had any experience with women and ended up succeeding his father as a gynecologist. His older sister, worried about whether he would be able to deal with female patients, uses her own body to teach them about sex. However, once he has experienced women, Bintaro gradually reveals a different personality and begins to humiliate his older sister and female patients through sexual harassment...