You weren't My Sister, but My Fiancée?!
Mangacompleted

You weren't My Sister, but My Fiancée?!

Other titles · Omae Imouto ja Nakute Iinazuke datta no kayo!? • お前妹じゃなくて許嫁だったのかよ!?
Also known as
Omae Imouto ja Nakute Iinazuke datta no kayo!?
Also known as
お前妹じゃなくて許嫁だったのかよ!?
Also known as
你原来不是我的妹妹而是我的未婚妻啊!?
Also known as
Kamu Bukan Adikku, Tapi Tunanganku?!
Also known as
Ты была не моей сестрой, а моей невестой!?
Also known as
Em Gái Tôi Là Hôn Thê Của Tôi!?
Also known as
お前妹じゃなくて許嫁だったのかよ!?
Also known as
You weren't my sister, but my fiancée!?

by Miraijin A

35 chapters
"Humanity, adore thy little sister—." "I wonder when my sister Kana started becoming distant from me—." Shina Takashi lamented his current days, where being ignored was not uncommon. One day, his parents dropped a shocking revelation. Not only was Takashi not their biological son... but he was also the fiancé of Kana, whom he thought was his sister! From siblings to potential romantic interests, it’s not easy to sort out feelings. The fluctuating emotions, the bewildering distance. Their relationship undergoes an inevitable change—! She's a sister but not a sister!

Chapters

Title details: mangadex