Yusuke spends his days in depression, being teased by his classmates for being a virgin. Yuka, the mother, is genuinely worried about her depressed son, and continues to speak kindly to him in order to give him confidence, but to no avail. Yuka, who couldn't see it, offered her own body and became the partner of her son's first experience. It was sex education that I started thinking about for my son, but Yusuke became dependent on his mother's body.