"Recently, my wife and I have been having sex less frequently. It's never been like that before..." Yuuta reunites with his college friend, Kent, for the first time in a long time. Kent is married, and his wife, Mary, is beautiful and lewd, and he boasts that "we still have sex three times a week." Yuuta, who has no girlfriend and is an extremely virile man, is frustrated. So he goes to visit Mary and forces himself on her. Mary resists Yuuta's excessive virility, but she climaxes many times, and after he cums inside her five days a week, she finally can't be satisfied with her husband...