Omae Imouto ja Nakute Iinazuke Datta no ka yo!?
You Weren't My Sister, but My Fiancé!?
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Omae Imouto ja Nakute Iinazuke Datta no ka yo!?

Alternative Titles

Japanese: お前妹じゃなくて許嫁だったのかよ!?
English: You Weren't My Sister, but My Fiancé!?
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Information

Type: Manga
Volumes: Unknown
Chapters: Unknown
Status: Publishing
Published: Sep 16, 2022 to ?
Genre: Romance Romance
Serialization: Dengeki Comic Regulus
Authors: Miraijin A (Story), Yunyanko (Art)

Statistics

Score: 6.431 (scored by 631631 users)
1 indicates a weighted score.
Ranked: #172382
2 based on the top manga page. Please note that 'R18+' titles are excluded.
Popularity: #6428
Members: 3,278
Favorites: 9

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Ranked #17238Popularity #6428Members 3,278
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Synopsis

"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!

(Source: Kadokawa, translated)

Characters

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Reviews

Oct 1, 2023
Preliminary (11/? eps)
7.4/10


Welcome back to another episode of “We’re not blood-related, so everything’s perfectly fine and legal!” But there’s just one small problem: Why is this manga actually good? Let’s be clear here; the plot isn’t good or original, nor are the character the most original, but their interactions are actually wholesome and pretty cute, which is enough to overpower my broken moral compass.

I’m usually not fond of incest, imouto stories, but this might be one of the few exceptions due to the characters having good chemistry and the small rationale of a sibling. The brother and sister are actually slightly rational with their thinking, mainly ...
Jan 27, 2025
Preliminary (20/? eps)
You can read the whole manga in an hour. This is basically an evolving love story between non-blood-related siblings.

The male MC discovers they are not genetically related in the first chapter, and everything continues after that. To my surprise, this is a simple, well-built story. Their family time and love are evolving into true love for each other. There may be some tropes, but the side characters are a great addition. It's also very interesting to see the parents actively help them get together.
This manga is the correct way to express natural and possibly healthy love between step siblings.

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