You weren't my sister, but my fiancée!?Omae Imouto ja Nakute Iinazuke datta no kayo!?; お前妹じゃなくて許嫁だったのかよ!?; Omae Imouto Janakute Iinazuke Datta no ka yo; Ты была не моей сестрой, а моей невестой!?; You Weren't My Sister, but My Fiancée?!

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 fiance! ? The definitive version of Reiwa's younger sister manga!