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)
Description
Type
TVSeason
Winter 2023Release Date
Status
Finished
Source
MangaEpisodes
12
Episode Length
24 min
Score
7.68 (230)Popularity
#739 (685)Official Streaming Platforms
Information Websites
Alternative Names
Romaji
Onii-chan wa Oshimai!
English
ONIMAI: I'm Now Your Sister!
Japanese
お兄ちゃんはおしまい！
Abbreviation
Onimai
Synonyms
Onii-chan is Done For!