Mizuki lives a happy married life with her kind and kind husband. However, Mizuki had one complaint. It's her living with her vulgar stepfather. She was tired of living with her stepfather, where sexual harassment was a daily occurrence for her. One day, her father-in-law found Mizuki who had fallen asleep while her husband was away. Taking advantage of her son's absence, he removes her underwear and devours her genitals, which smell like female and sweat, and then forcibly rapes her. From then on, Mizuki continues to have her young body polluted by her stepfather's beastly sexual desire...