Yuri is a 30-year-old sex monster. As she gets older, her sex drive gets stronger and she can't get enough of it. When her husband goes out for work, she devours men at will. The neighbour's husband who brought the circular to the courier, and a sex friend she met on a social networking service. But the lust that she can't stop even after all that has happened finally reaches her stepson, who is still a virgin...