Yuzuru can't hide his joy at meeting his mother's friend Hiyori, the ideal woman he has admired since childhood. Hiyori's lewd nature is revealed when she drinks, and she can't hide it, so they end up having sex... Hiyori feels guilty about having made a move on her friend's son. However, once she has experienced the pleasure of being with a young man, it's hard to stop her so easily... The two secretly enjoy their fleeting rendezvous. And then, the time to part ways finally comes...