By the time my husband returns... the unforgivable daily life of my brother-in-law and brother-in-law

His wife Haruki is so lonely for her husband who is dedicated to working and doesn't care about his family that he has grown physically, and by continuing to do so, he ends up having a physical relationship with his brother-in-law Katsumi, and by continuing to do so, he fills in the gaps in his heart. As they meet once a week, Haruki's feelings, which had been so guilty about her husband, eventually transformed into love for Katsumi... One day, Katsumi decided to go abroad due to work circumstances. Katsumi, who has taken his relationship with her sister-in-law as serious, tries to refuse, but Haruki pushes her tightly...