Sumire leads a carefree married life with her kind husband. However, she has one complaint: living with her lewd father-in-law. Lacking tact, he constantly harasses her, making her sick of it. One day, while Sumire was asleep during the time her husband was out, her father-in-law took advantage of his son's absence and moved her underwear aside to indulge in her genitals, which smelled of both female and sweat. Having tasted her, her father-in-law then started raping Sumire every day, treating her like a sex slave...
