I was busy with work and missed my marriage period, but fortunately I was able to marry a beautiful and good-looking wife who was too good for me. Her wife, Rieko, has remarried, but she and her stepdaughter, Taka-kun, live happily ever after. One day, as usual, when I got home from work, the sheets I had just changed were dirty. I felt strangely uneasy, but I didn't realize that this was the beginning of my betrayal...