Housewife Nanao lives with her husband and father-in-law. Lately, her father-in-law's dementia has worsened to the point where he mistakes her for his deceased wife… But kind-hearted Nanao willingly acts as if she were his late wife, devotedly caring for him. However, such kindness backfires, and one day her father-in-law relentlessly pursues her body! Understanding her father-in-law's feelings and driven by her own frustration, Nanao ends up having a relationship with him… As her husband ignores her, Nanao and her father-in-law's acts escalate, and they intensely indulge in each other's bodies, becoming engrossed in thick sex akin to that of a married couple.
