Makoto Toda is a serious salaryman who's built a happy family with his wife and three adorable daughters by taking great pains to avoid trouble of any kind. One day, Saya appears at his workplace as a contractor. For reasons only known to herself, she tries to seduce him, and they finally begin an affair. Starting as a discrete relationship, it escalates and ends up breaking up his family. Making matters worse, his trusted right-hand woman, Tsuboi, comes onto him. It seems that the strong sexuality of women has ruined Toda's life, but he discovers a fact that proves to be even more astonishing.