It's been six months since his father left. His mother Kana is still acting strong today. But Yusuke is Kokoro when he sees Kana's lonely expression from time to time. How can he comfort her? One day, Yusuke is troubled by this, and he witnesses Kana indulging in masturbation, then sobbing after orgasming. Seeing this, Yusuke decides to comfort Kana's body in place of his father. Kana is confused, but when she realizes that this is her son's kindness, she turns feminine and accepts it.