Omae Imouto ja Nakute Iinazuke datta no kayo!

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!