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Haruki's wife, Haruki's loneliness for her husband, who devotes himself to work and neglects his family, ends up having a physical relationship with his brother-in-law, Katsumi. As they meet once a week, Haruki's feeling of guilt towards her husband gradually turns into love for Katsumi. One day, Katsumi decided to go abroad for work reasons. Katsumi, who takes his relationship with his sister-in-law seriously, tries to turn him down, but Haruki strongly holds him back.