Visiting his girlfriend’s home for the first time, Shingo is warmly welcomed by her mother, Kurea. Her gorgeous figure, beautiful face, and fitted business suit leave him too aroused to follow the conversation. An insurance saleswoman, Kurea begins pitching him on his future while slipping suggestive touches into her sales talk. Overwhelmed by her mature allure, he gets painfully hard—and Kurea secretly takes care of him without letting her daughter find out, beginning an affair that keeps drawing him back.