After six years of marriage, innocent Saki remains devoted to her husband, Kosuke. When the pandemic drives his company into the red and leaves him scrambling for funds, she suggests seeking help from his estranged father, Katsuji, a wealthy landowner. Kosuke left home because he despised his greedy father, but reluctantly returns with Saki. Katsuji readily agrees to cover the ¥80 million debt, though his generosity hides a depraved demand: Saki's body will serve as collateral, leaving her at the mercy of her brutal father-in-law.