Having lost all trust in women due to relentless bullying from his older sister (Sayuri) during childhood, Bottaro grew into adulthood without any experience interacting with the opposite sex. As a result, he inherits his father's obstetrics and gynecology clinic but feels deeply uneasy about treating female patients. To help him, his sister attempts sex education using her own body. Once Bottaro experiences a woman for the first time, he begins to change gradually. A new personality emerges—one that subjects his sister and female patients to humiliating doctor harassment. The story unfolds as his actions spiral out of control.