You weren’t my sister, but my fiancée!?

Content:
Humanity, love your little sister. I miss the time when her younger sister Kana was fond of me. Takashi Shiina lamented the current days when he was often ignored. One day, his parents cut out a shocking story. Surprisingly, he wasn’t his real son… but he was his sister Kana’s fiancée! ? The definitive version of Reiwa’s younger sister manga!
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