After her husband's death, Miki lives alone with her son, Takeshi. One day, worried that he isn't going to school, she calls him out and tries to talk to him—only to have him discover her secret: during her marriage, she became aroused whenever her husband hit her. Dominated by her son and unable to resist her own arousal, Miki—a true masochist—eventually whispers, "We're perverts, aren't we?" and begins forging a new, forbidden relationship.