Three years into our marriage, I thought I was living a perfect life with Tsumugi, the woman I fell for at first sight. But she stops paying attention to me, makes excuse after excuse to avoid sex, and increasingly stays out until morning. Suspicious, I hire a private investigator and confirm she is cheating. The report says she visits a hotel every time she meets the other man, filling me with jealousy. I have no intention of leaving her, so when she sneaks home one morning, I demand possessive baby-making sex to overwrite her lover's mark...