Yumi was dumped by her boyfriend due to her overwhelming sexual desire. Meanwhile, Takuya possesses an exceptionally strong libido, and the two immediately start having sex upon meeting. Their intense sexual drives clash as they fiercely compete for dominance. Eventually, Yumi is defeated, left wondering, "How can I win...?" Seeing her distress, Takuya's mother gives Yumi a secret aphrodisiac to boost her desire. Hesitantly drinking it, Yumi's body heats up and gradually succumbs to lustful thoughts. Now on equal footing, Yumi vows revenge and a new battle begins.