After six years of marriage, the pure and gentle Saki has faithfully supported her husband, Kosuke. However, due to the impact of the pandemic, Kosuke's company has fallen into debt, and seeing him struggle financially, Saki grows determined to do anything for his sake. She comes up with the idea of seeking financial help from her estranged, wealthy father-in-law, Koji, who is a landlord. Previously, repulsed by her greedy father, she had left home, and Kosuke never particularly liked his father-in-law either. But for her husband's sake, she reluctantly decides to return to her family home. Koji readily agrees to provide financial support, but harbors malicious intentions beneath the surface. He then declares with cruelty, "The collateral for your husband's debt will be your body." As Saki heads toward him, she is gradually consumed by her father-in-law's desires.