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On a summer day when the sound of cicadas was noisy, I returned to my parents' house for the 17th anniversary of my mother. - It was the presence of my sister, Riho, who always tried to go home every year. - She is her longing sister who has been taking care of me for her mother who died early. - As an adult, my sister and I are married, but I still have a special feeling for her sister that is different from her siblings. - And on the night when the litigation was over, I was called by my father to talk to me, and I was confessed that I was not a real sibling with her sister, Riho.