The wife finds herself overwhelmed by an unfamiliar, meticulous caressing, her body's inhibitions crumbling. Keita, the husband, and his wife Eri begin living with his father. Eri, dissatisfied with her sex life with Keita, inevitably crosses a line with her father-in-law. Mayumi, portrayed as innocent and naive, trembles and reacts with childlike vulnerability at even the slightest touch, ultimately being violated by her father-in-law's skilled techniques. Meanwhile, Yui's secret debt to her father-in-law is discovered, leading to a change in his behavior towards her. One day, Hana accidentally witnesses her father-in-law's aroused state while cleaning him, blurting out, "Should I clean your genitals too, Father-in-law?" Note: The content may vary depending on the distribution method.
