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