Fed up with life with her mother, Yamaguchi Miki ran away from home. While wandering around, thinking that "older men are coming up to me because they want my body," she met Endo Jiro, who was on the verge of divorce. The two share a common interest, and the moment they arrived at Endo's apartment, they started having sex. The bodily fluids of the middle-aged man and the young woman mixed together, and the smell of sex filled the room. This continued every day for a week. Then, she found out that Endo's birthday was coming up...