Mizuki has been living a happy married life with her kind husband, but there was one thing she wasn't satisfied with - having to live with her perverted father-in-law. His constant sexual harassment made her feel uncomfortable about their daily lives together. One day, when Mizuki fell asleep during her husband's absence, her father-in-law found her. He took advantage of the situation by exposing her underwear and licking her sweaty, aroused body parts before forcing himself inside her against her will. Since then, Mizuki has been enduring her father-in-law's animalistic desires, defiling her young body over and over again...