お兄ちゃんはおしまい！
- Animation
- Comedy
When lazy, erotic-game loving Mahiro Oyama is transformed into a girl by his younger scientist sister's experiments, he becomes determined to change back, only to recognize that with his new opportunity, he may want to turn his life around.
ONIMAI: I'm Now Your Sister! is a Japanese animated comedy series that premiered on January 5, 2023. The show follows Mahiro, a lazy gamer who is magically transformed into a girl by his scientist sister and must navigate his new life while searching for a way to change back.
When does ONIMAI: I'm Now Your Sister! come out?
Where to watch
Streaming availability in United States
United States
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Rent or buy
Digital purchase & rental in United States
Where to watch ONIMAI: I'm Now Your Sister! by country
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BrazilTop cast
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Marika KounoMahiro Oyama (voice)
Kaori IshiharaMihari Oyama (voice)
Hisako KanemotoKaede Hozuki (voice)
Minami TsudaMomiji Hozuki (voice)
Kana YuukiAsahi Ohka (voice)
Natsumi HiokaMiyo Murosaki (voice)
Hiroaki MiuraSeme (voice)
Hisayoshi SuganumaUke (voice)
ReimiChild - Brother (voice)
Emiri SuyamaWoman B (voice), Woman A (voice), Clerk (voice)
Yuuya UchidaLeonardo (voice)- Hironari NemotoMovie Narration (voice)
Erisa KuonWoman B (voice), Hairdresser (voice), Woman A (voice)
Kousuke GotoSpabone (voice)
EnakoNicolala (voice)
Trailer
Promotional Video [Subtitled]
Seasons
1 season
Episodes · Season 1
Full season| # | Title | Air date | Runtime | Rating |
|---|---|---|---|---|
| 01 | Mahiro's Confusing New Body | 2023-01-05 | 23m | 7.3 |
| 02 | Mahiro's Time of the Month | 2023-01-12 | 23m | 5.0 |
| 03 | Mahiro's Close Encounter | 2023-01-19 | 23m | 3.8 |
| 04 | Mahiro's New Friend | 2023-01-26 | 23m | 6.0 |
| 05 | Mahiro Discovers Adventure and Social Gatherings | 2023-02-02 | 23m | 6.5 |
| 06 | Mahiro Goes Back to Middle School | 2023-02-09 | 23m | 6.5 |
| 07 | Mahiro's Role-Playing Game | 2023-02-16 | 23m | 6.5 |
| 08 | Mahiro's First Girls Sleepover | 2023-02-23 | 23m | 6.5 |
| 09 | Mahiro Rings in the New Year | 2023-03-02 | 23m | 3.8 |
| 10 | Mahiro Ponders Boobs and Identity | 2023-03-09 | 23m | 6.5 |
| 11 | Mahiro Pretties Up | 2023-03-16 | 23m | 6.0 |
| 12 | Mahiro's Future as a Sister | 2023-03-23 | 23m | 6.5 |
Related & spin-offs
Other titles fans of ONIMAI: I'm Now Your Sister! tend to follow.
Is ONIMAI: I'm Now Your Sister! renewed or cancelled?
ONIMAI: I'm Now Your Sister! has ended — it concluded its planned run.
ONIMAI: I'm Now Your Sister! — frequently asked
When did ONIMAI premiere?
ONIMAI: I'm Now Your Sister! premiered on January 5, 2023.
Is the series finished?
Yes, the series has ended after one season.
How many episodes does season 1 have?
Season 1 consists of 12 episodes.
What is the main premise?
The story centers on Mahiro, a lazy otaku who is transformed into a girl by his younger sister's scientific experiment and must adapt to his new life while seeking a way to reverse the transformation.
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