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Kimika had two sons, but divorced 12 years ago, and her brother was taken over by Kimika and her younger brother Yuki was taken over by her husband. Eventually, the independent brother left Kimika, and instead, his younger brother Yuki came to live with him, saying that it was convenient for going to college. Unlike her older brother, Kimika went on a hot spring trip together to make her feel pity and affection for Yuki, who has a strong sense of independence and cannot be pampered by her mother.