"Lately, I've been having sex with my wife less and less; now I'm lucky if it happens once a week..." Shinji reunites with his friend from college, Yuji. Yuji's wife, Marina, whom he married a few years ago, is not only beautiful and charming, but also very sexually active, and he boasts about her, saying, "Marriage is great." Shinji, whose sexual desire is overwhelmed, is frustrated. So he secretly visits Marina and forces himself on her. Marina resists Shinji's uncontrollable sexual prowess, but she climaxes, and after being creampied five days a week, Marina finally becomes dissatisfied with her husband...