Chisato Shoda lives with her husband and son, constantly timid and nervous by nature. Her son bullies her, which worries her deeply. One day, he suddenly asks, "Don't guys become more confident when they're with women?" and embraces her. She tries to resist, but overwhelmed by excitement, she is penetrated and involuntarily begins to feel pleasure. In that moment, he murmurs, "You're enjoying it. Women really do prefer dominant men, don't they?" From then on, her son begins assaulting her every night. Desiring to become a stronger man, he seeks his mother to fulfill that desire.