On his way home, Masaru gets a call from his mother asking him to stop by her sister's house to pick something up. Masaru accidentally catches his aunt masturbating in front of the TV with a porn movie. He tries to leave, but Miyuki notices him, convinces him to stay and seduces him. When Masaru's stepmother (Miyuki's sister) catches them doing this, she cannot resist her lust and joins them. Meanwhile, business at the small diner goes on as usual. The senior manager has imposed strict sexual penalties on his staff for breaking the rules, and he closely monitors their observance. Masaru couldn't even suspect how his visit to the diner would end