In this adult stepson role-play, Mariko marries a man whose son Yusuke has stopped attending school. Yusuke cannot accept his father's new wife as his mother and keeps his distance even after they begin living together. Hoping to grow closer, Mariko tells him she wants to support him as both family and a mother, and he gradually opens up. He still refuses to return to school, however, eventually admitting that a bad experience with a woman is the reason. When Yusuke asks to learn about a woman's body, Mariko gently says, “Mom will start by teaching you how grown-ups kiss,” then guides her inexperienced adult stepson into sex and takes his virginity.