Yuriko (Yuriko Mikumo) desperately resists as her son shouts, "I can't hold back anymore!" and moves toward her. She had noticed his strange behavior ever since he caught a glimpse of her bathing. Yet she never imagined he would treat her, his own mother, in such a way. Overpowered by her grown son's strength, she eventually stops resisting. Resigned to the situation, she proposes to teach him about sex education. From there, a new episode unfolds—one that transcends the normal boundaries between mother and son.