Daisuke comes to Naoya's house for the first time in a while to borrow a university report. While Daisuke and Naoya's mother, Kayoko, are reminiscing about old times, Kayoko presses her breasts against Daisuke and touches his body. Kayoko may not have thought this was a casual action, but it was enough to make Daisuke misunderstand. Daisuke, thinking that Kayoko is seducing him, can't help but confess his feelings. Of course, she turns him down, but he presses her strongly, saying, "It's because my aunt is flirting with me!" Kayoko is frightened by his intensity and says, "Just once..." and they have a relationship.