Monami, a diligent female college student, and her boyfriend are dating each other as virgins, so their sex life doesn't go well, and Nami is not satisfied with the situation. One day, Takeshita-san, an old friend of her father's, comes to visit the house and they end up having sex while drunk. Monami's body and Kokoro are melted by the skilled caresses of this middle-aged man, and from that day on, her body becomes easily aroused only by older men, and her sexual desire is unstoppable, so she even starts seducing them herself...