Yumi was dumped by her sex friends because she had too much sex drive. Takaya has an extraordinary sex drive. They meet and have sex. They compete for dominance, but Yumi loses. Seeing Yumi struggling, Takaya's mother gives her a secret drug that is the source of her sex drive. She drinks it cautiously, and her body gets hot, becoming increasingly lewd. Now the conditions are the same. The revenge begins.
