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My younger sister, Umi, who came to Tokyo to go to school, decided to stay with my brother for a while. Living together with my younger sister, who still has an accent in her hometown dialect, made me smile and enjoy my time with her. However, one day, by chance, I was playing professional wrestling with my older brother and sister, and I saw my sister's indescribably teary-eyed reaction. , Unexpectedly, I was surprised...!