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Onimai: I’m Now Your Sister!

Onimai: I’m Now Your Sister!

Onimai: I’m Now Your Sister!

TV 2023 Completed 75%

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)

Official Siteonimai.jp

Episodes12 / 12

Duration24 min

SeasonWinter

CountryJapan

AdultNo

RomajiOnii-chan wa Oshimai!

Nativeお兄ちゃんはおしまい！

Last Update2026-07-17 10:47:44

StudiosEGG FIRM, Studio Bind

Onimai: I’m Now Your Sister!
TV 2023 Completed 75%

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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