Yuu lived happily, pure and innocent, knowing no man other than her husband. But Akari, noticing Yuu's happiness, trembles with jealousy born from dissatisfaction in her own marriage. She manipulates her own lover and threatens Yuu, determined to make her hers. Yuu's heart wavers under the seduction, sinking deeper into a forbidden relationship. Soon, she becomes possessed by a special kind of pleasure unattainable through relations with men.