Mai lives a carefree married life with her reliable husband. However, Mai has one complaint - living with her vulgar father-in-law. She is fed up with living with her father-in-law who suddenly showed up at her house and stayed over. One day, when Mai falls asleep while her husband is away, her father-in-law finds her and takes advantage of the absence of his son to push aside her underwear and devour her genitals, which smell of female and sweaty. Having gotten a taste for it, her father-in-law rapes Mai as he pleases almost every day, treating her like a sex slave...