Yuuichi, who loves his wife Yuko but has recently been lacking in energy on that front. Worried that Yuko might get fed up with him if things continued this way, Yuuichi secretly purchases an aphrodisiac. However, while Yuuichi is out, Yuko and their son Kota drink a beverage laced with the aphrodisiac. As Yuko's body heats up and her womb aches, and Kota becomes erect, the two gradually lose their reason and fiercely give in to each other's desires, culminating in a physical relationship. The pair later realize that the cause of their mistake was the aphrodisiac...
