Mr. and Mrs. Hatano started their lives with their father-in-law when their mother-in-law died. Since her marriage, her wife, Yui, has played an M woman who has been devoting herself to a man to satisfy her husband's desires. However, one day while caring for his father-in-law, he witnesses his father-in-law's Ji-Po who accidentally erected. Seeing the appearance of my father-in-law who erects even though I can not move satisfactorily, something pops in Yui ...