Married for two years now... Yuu has been growing frustrated as her husband comes home late, and their attempts to conceive have yet to succeed. One day, her sister-in-law Hitomi suddenly shows up at the house and reveals that her husband has been visiting brothels. Hitomi, who loves her younger brother more than a sister should and constantly nags Yuu, has always irritated her with her condescending attitude. Their feminine pride clashes, sparking a fierce rivalry between the two women. With tensions rising over the husband's nocturnal activities and growing doubts about Yuu's inadequacy as a wife, the cracks in their marriage begin to deepen...