The eldest son, a farmer living in the countryside, comes to Tokyo on business related to the NO Association and ends up staying at the apartment of his second son, who lives in the city, for about three days. The serious and simple-minded older brother is troubled by the voluptuous curves of his beautiful, busty and chaste "younger brother's wife" Miina, but he gradually becomes unable to bear it...! The whole story is centered on "breast groping" and "titty groping", and is a must-see for big-breast lovers, making it a full-scale domestic incest tit-groping drama...