Daisuke is staying with his aunt Shizuno, who lives in Tokyo, while he is job hunting. Shizuno has always been kind and looked after Daisuke, and Daisuke has always admired her. One day, while Shizuno is having lunch as usual, Daisuke seems a bit restless. "Show me," Daisuke says shyly, hiding his crotch. When she removes his arms, she finds his erect penis. Shizuno is excited to see a man's erect penis for the first time in a while, and is happy to see her nephew grow up, and she starts to teach him about sex.