Ryoko is the popular shopping district's Madonna, known for her overflowing maternal love and oozing sex appeal. One day, at the request of the club president, Tabuchi, she decides to take part in the neighborhood athletic meet and immediately begins practicing. After practice, Tabuchi, the mechanic Tatsu, and Ryoko have a party, and they get excited talking about Tatsu's virginity... Ryoko, excited by Tatsu's naivety, tries to teach her the good things about women with Tabuchi's guidance. Tabuchi, who has been secretly watching, can't contain his excitement, and even afterwards, Ryoko's body still throbs...