I'm Shintaro. My older brother Takehisa came to Tokyo from the countryside of Shizuoka for a job hunt, so I agreed to let his younger brother Makoto stay at my place for about a week. One day, I left work early and returned home to catch my wife Miho and Makoto in the middle of a sex scene. Barely holding back my rage, I confronted Miho and demanded the full story. What followed took an unexpected turn.