Her daughter brings her boyfriend home. Kaori gives her blessing to the couple, but as a mother she also gives the young boy a warning. "Make sure you use birth control." That was the obvious thing a parent should do. But Kaori, who loves naive boys, gradually begins to go beyond what a parent should do. "You haven't done it with my daughter yet? Maybe you're still a virgin?" Her boyfriend is flustered by the fact that he has hit the nail on the head. Kaori's naive reaction makes her unable to contain her arousal...