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!
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
N/A
Latest Release(s)
N/A
Status 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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Forum
0 topics, 0 posts
Click here to view the forumUser Rating
Average: 7.1 / 10.0 (93 votes)
Bayesian Average: 6.9 / 10.0
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Last Updated
April 21st, 2025 6:44pm PDT - 4 days 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 #379 
(-171)
(-171)Monthly Pos #1083 (-423)
(-423)3 Month Pos #1974 (-195)
(-195)6 Month Pos #2480 (-57)
(-57)Year Pos #2512 
(+622)
(+622)List Stats
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