I had been happily married to Reiko for five years, but even though we didn't say it out loud, we both felt like our relationship had become stale. One day, while talking to my colleague Kawaguchi, we got onto the subject of women, and he boasted that married women in their third to fifth year were the easiest to seduce. I trusted Reiko, so I told him that that wasn't true at all, but my married life had become stale, and I was led astray by Kawaguchi's words. A few days later, I invited Kawaguchi and my wife over to my house, and forced them to be alone together for three hours, making up some excuse...