Saki Okuda SSIS-571: She was used to manipulate and exploit her father-in-law, who took on 80 million yen of debt in place of her husband, and her desires were violated by him.

Married for six years, the innocent Saki wholeheartedly supports her husband, Kosuke. Due to the pandemic, their business has fallen into deficit. Watching her husband struggle daily to raise funds, Saki proposes to ask her estranged father-in-law, the landowner Kinman, for assistance. Disliking her domineering father and the estranged Kosuke, Saki hesitates, but reluctantly, the two return to his hometown together. Their father-in-law, Katsuji, quickly agrees to provide financial assistance, but he harbors wicked intentions… "My body is the guarantee for my husband's loan," the daughter-in-law is thus violated by her sadistic father-in-law.