After being laid off from his company and going through a late-life divorce, Chigusa Hara's stepfather found himself with nothing but his home, facing the final years of his life in despair. Feeling sorry for him, his son and daughter-in-law took him in. Five years passed, and the son began considering moving his father into a care facility, but the stepfather opposed the plan. Instead, he began pursuing a secret desire—targeting his daughter-in-law, Chigusa. What follows is a forbidden tale of incest, as suppressed emotions and carnal urges lead to creampie-filled encounters between the milf and her stepfather under the same roof.