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Kozue, an older sister, and Hina, a younger sister, who lost their parents when they were young and lived by supporting each other with their sisters. - She has always loved her sister, who is kind and caring for her, but as she grows up, she gradually realizes that she is a woman. - Since her sister also had a big broken heart, she thought the man was a mess and was worried about the woman, but she didn't have the courage to step forward.