Keiichi and Ranka have been dating for about 3 months. Ranka, who looks like a gal but likes games and anime, was kind to the weak Keiichi. However, Keiichi is not accustomed to sex, and even if he is asked to blame him, he can not lead well, but rather he gets acme at the moment of inserting. Keiichi's father pays attention to such Ranka. He is Keiichi's father who plans to be alone with Ranka and puts an aphrodisiac in tea to make Ranka drink it. And she forcibly hugged Ranka's body, which was lit by her medicine ....