Yuu and Takashi are an ordinary couple living a quiet, happy life together, deeply in love. One day, Takashi is asked by his superior to lend Yuu to him for just one night in exchange for a promotion to section chief. Though he values his career, Takashi, who truly loves his wife, firmly refuses, putting her feelings above his own advancement. His boss is stunned by the decision, but Takashi stands his ground. Meanwhile, Yuu, betraying her husband's trust, begins a secret physical affair with Takashi's younger brother. When the truth comes to light, Takashi's anger reaches its peak. His response is beyond imagination. A story of love, betrayal, and extreme consequences unfolds as their lives spiral into obsession, domination, and submission—where Yuu becomes nothing more than a sex slave and cumdump for her husband's cruel punishment.