Akari enjoys a comfortable married life with her kind husband, but she has one complaint: they share their home with his vulgar father. One day, while her husband is away, an exhausted Akari falls asleep. Her father-in-law finds her and takes advantage of his son’s absence to ogle her firm breasts and the intimate flesh beneath her thick, glossy black pubic hair. The sight of his daughter-in-law’s pussy turns him into a beast in heat, and he sets his sights on the young adult woman living under the same roof.