Onii-chan wa Oshimai! 
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Description
From Kodansha:
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.
Type
Manga
Related Series
Associated Names
Ab sofort Schwester!
Onii-chan Is Done for
Onii-chan Is Done for!
ONIMAI: I'm Now Your Sister!
Мой братик теперь не братик!
Мій братик вже не братик
お兄ちゃんはおしまい！
不当哥哥了！
别当欧尼酱了！
Groups Scanlating
Latest Release(s)
c.105 by daily multivitamin 22 hours ago
c.104 by daily multivitamin 1 month ago
c.103 by daily multivitamin 2 months ago
Search for all releases of this seriesStatus in Country of Origin
9 Volumes (Ongoing)
Completely Scanlated?
No
Anime Start/End Chapter
Starts at Vol 1, Chap 1
Ends at Vol 4, Chap 38 - Skips Chap: 4, 8-8.5, 10.5, 18.5, 20.5, 24.5, 25.5, 26.5, 32-32.5, 33.5
User Reviews
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Click here to view the forumUser Rating
Average: 7 / 10.0 (96 votes)
Bayesian Average: 6.82 / 10.0
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Last Updated
September 20th, 2025 5:52pm PDT - 1 month ago
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Genre
Categories
Category Recommendations
Recommendations
N/A
Author(s)
Artist(s)
Year
Original Publisher
Serialized In (magazine)
Comic REX ()
Licensed (in English)
Yes
English Publisher
Kodansha USA (9 Digital Volumes; Ongoing)
Activity Stats (vs. other series)
Weekly Pos #471 
(-261)
(-261)Monthly Pos #1330 (-306)
(-306)3 Month Pos #2532 (-12)
(-12)6 Month Pos #2863 
(+311)
(+311)Year Pos #2942 (+369)
(+369)List Stats
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