Yusuke, who works for a magazine and eavesdrops on married women's infidelity, accidentally overhears a scene of a murder. As he eventually discovers the culprit and peeks into his life, he learns that Wakana, a married woman, is his next prey... The story depicts the reality of married women who betray their husbands for money and have affairs, as seen through the eyes of the main character, a wiretapping enthusiast who lives in the underworld.