Yusuke spends his days in depression, being teased by his classmates for being a virgin. Her mother, Yuka, worries about her depressed son from the bottom of her heart, and continues to speak kind words to make her confident, but to no avail. Her Yuka, who has not seen her, presents her own body and becomes the partner of her son's first experience. It was sex education that started thinking about her son, but Yusuke became dependent on her mother's body.
