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My sister's brick ● Since my parents passed away when I was a school student, I have lived by supporting each other with my sister. - Her younger sister, Yuu, loved her sister from an early age, but from the time she reached her adolescence, she began to give her a special feeling that she didn't even know. - And her sister's broken heart causes her sister to hit her emotions, and her forbidden relationship rises rapidly. - Ren also accepts the feelings of her sister ...