A man who lost his wife. He has been feeling especially lonely lately, and has been masturbating alone despite his age. Then his son's wife, Miharu, comes to look after him and stumbles upon him masturbating. As the atmosphere between them becomes tense, Miharu says to him, "Father-in-law, if you don't mind, I can help you." Those words become the catalyst for a physical relationship. She is surprised by her father-in-law's dick, which is thicker and harder than her husband's, but since she hasn't had sex with her husband for a long time, her father-in-law gives her such pleasure that she becomes aware of herself as a woman...