Oniichan wa Oshimai!
Onimai: I'm Now Your Sister!
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Oniichan wa Oshimai!
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Alternative Titles

Synonyms: Onii-chan is Done For
Japanese: お兄ちゃんはおしまい！
English: Onimai: I'm Now Your Sister!
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Information

Type: Manga
Volumes: Unknown
Chapters: Unknown
Status: Publishing
Published: Jun 27, 2018 to ?
Genre: Comedy Comedy
Themes: CGDCT CGDCT, Magical Sex Shift Magical Sex Shift
Serialization: None
Authors: Nekotoufu (Story & Art)

Statistics

Score: 7.841 (scored by 77517,751 users)
1 indicates a weighted score.
Ranked: #12452
2 based on the top manga page. Please note that 'R18+' titles are excluded.
Popularity: #900
Members: 23,585
Favorites: 1,035

Available At

Kodansha
Kodansha USA

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Oniichan wa Oshimai!
7.84
Ranked #1245Popularity #900Members 23,585
MangaNekotoufu (Story & Art)
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Synopsis

Mahiro Oyama was just a normal erotic-game loving dude...until he woke up one morning as a woman! Turns out his mad-scientist little sister, Mihari, tried out one of her new experiments on him... with a disastrous outcome, as far as Mahiro's concerned! But Mihari is as determined to study him as he is determined to go back to his shut-in, game-playing life, and one thing's for sure... life is going to get a whole lot weirder from here on out!

(Source: Kodansha USA)

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Background

Oniichan wa Oshimai! is a web manga released on the author's pixiv account since February 25, 2017, and published in print by Ichijinsha since June 27, 2018. The web manga has also been published as doujinshi since May 6, 2017, when the first volume was released at COMITIA 120.

The series has been published digitally in English as Onimai: I'm Now Your Sister! by Kodansha Comics USA since August 31, 2021.
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Oniichan wa Oshimai!
Adaptation (TV)
Oniichan wa Oshimai!
 
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More characters
Characters

Oyama, Mahiro
Oyama, Mahiro
Main
Oyama, Mihari
Oyama, Mihari
Main
Hozuki, Kaede
Hozuki, Kaede
Supporting
Ouka, Asahi
Ouka, Asahi
Supporting
Hozuki, Momiji
Hozuki, Momiji
Supporting
Murosaki, Miyo
Murosaki, Miyo
Supporting
Fujimi, Nemu
Fujimi, Nemu
Supporting
Tenkawa, Nayuta
Tenkawa, Nayuta
Supporting
Nagase, Miyako
Nagase, Miyako
Supporting
Senkawa, Minato
Senkawa, Minato
Supporting

Reviews

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9 Recommended
0 Mixed Feelings
0 Not Recommended
All reviews (9)
Aug 26, 2023
estroRin
Recommended
Preliminary (71/? eps)
I'm writing this review from the standpoint a trans woman who reaaaaally sees this as unintentionally relatable at time, or wish fulfillment. I know a majority of people are not this way, and that's perfectly fine.

Onimai means a lot to me on an emotional level, it's primarily what cracked my trans egg all the way in 2018 when there were only a few chapters released. I read it in a hotel room at 3am, and promptly forgot the name of the series a week later. Forward to 2022 where I see a gender-bender anime get announced with a name that keeps poking in the back ...
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Apr 19, 2023
rikarem
Recommended
Preliminary (74/? eps)
A pretty good story of a guy used as a guinea pig and turned into a girl weird thing right? and the person that turned him into a girl is his sister!

so if you want to know how he lives after this read it! it is fun! He sometimes has problems adapting which makes great and funny scenes, it has a great story (maybe a little predictable) but I am sure you will have fun reading it!

(I am straight but he looks cute ngl)

(IMPORTANT NOTE: when you are reading this get ready because FBI might just knock your door anytime!)
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Apr 4, 2023
Tchurubangos
Recommended
Preliminary (23/? eps)
My opinion on a manga where the protagonist transforms into a girl would be that this premise could offer a great variety of comedic and interesting opportunities to explore the unique experience of transforming into another gender. It would be fascinating to explore the implications and challenges that the protagonist would have to face while adapting to a new gender identity.

Furthermore, the idea of a cute and charming protagonist could be very appealing to many readers. This could lead to a great emotional appeal and the creation of interesting secondary characters that help the protagonist adjust to their new life.
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More discussions
Recent Forum Discussion

Poll: Oniichan wa Oshimai! Chapter 29 Discussion
Sean- - Jun 29, 2019		 4 repliesby -_-NyxCiara-_- »»
Dec 8, 11:17 AM
Poll: Oniichan wa Oshimai! Chapter 28 Discussion
Sean- - May 27, 2019		 3 repliesby -_-NyxCiara-_- »»
Dec 8, 11:13 AM
Poll: Oniichan wa Oshimai! Chapter 27 Discussion
LoneReborn - Apr 27, 2019		 4 repliesby -_-NyxCiara-_- »»
Dec 8, 10:53 AM
Poll: Oniichan wa Oshimai! Chapter 26 Discussion
Kuma - Apr 1, 2019		 3 repliesby -_-NyxCiara-_- »»
Dec 8, 10:49 AM
Poll: Onii-chan wa Oshimai Chapter 25 Discussion
Sean- - Feb 28, 2019		 4 repliesby -_-NyxCiara-_- »»
Dec 8, 10:32 AM

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