Story
Takashi Shiina longed for the days when his little sister Kana adored him. To his consternation, these days he's more likely to be ignored instead. Then one day, their parents dropped a bombshell revelation. Not only was he not their biological son… but they are also asking him to get engaged to his little sister Kana!? A new kind of imouto manga for the Reiwa era!
Synopsis via AniList (English).
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Picked from our own catalogue — same author, or the genres overlap.