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ONIMAI: I'm Now Your Sister!

2023·Series·TV-14·24 min·7.5(62)

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.

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Where to watch ONIMAI: I'm Now Your Sister! in United States

Click a service to open ONIMAI: I'm Now Your Sister! there. Availability last verified on June 20, 2026.

Where is ONIMAI: I'm Now Your Sister! streaming around the world?

CountryStreaming onRent / Buy
United StatesCrunchyroll, Crunchyroll Amazon ChannelAmazon Video
United KingdomCrunchyroll, Crunchyroll Amazon Channel
CanadaCrunchyroll Amazon Channel, Crunchyroll
AustraliaCrunchyroll, Crunchyroll Amazon Channel
GermanyAniverse Amazon ChannelAkibapass
FranceAmazon Prime Video, Animation Digital Network, Anime Digital Network Amazon Channel, Amazon Prime Video with AdsAmazon Video
BrazilCrunchyroll, Crunchyroll Amazon Channel
JapanHulu, U-NEXT, Anime Times Amazon Channel, dAnime Amazon ChannelAmazon Video
South KoreaWatcha

About ONIMAI: I'm Now Your Sister!

ONIMAI: I'm Now Your Sister! is a 2023 Japanese-language animation and comedy series. The cast is led by Marika Kouno, Kaori Ishihara, Hisako Kanemoto. It spans 1 season and 12 episodes and has concluded. Viewers rate it 7.5/10 across 100 ratings. In United States, it is currently streaming on Crunchyroll, Crunchyroll Amazon Channel.

ONIMAI: I'm Now Your Sister! was produced by Studio Bind, EGG FIRM, and Ichijinsha and made in Japan. It was first aired on January 5, 2023, and carries a TV-14 certification.

First aired
January 5, 2023
Last aired
March 23, 2023
Original language
Japanese
Age rating
TV-14
Status
Ended
Seasons
1 (12 episodes)
Network
AT-X
Country
Japan
Production
Studio Bind, EGG FIRM, Ichijinsha
#slice of life#middle school#based on manga#junior high school#school life#ecchi#anime#gender swap#age change#grand#middle school girls#japanese junior high schooler#enraged

ONIMAI: I'm Now Your Sister! cast & crew

The cast features Marika Kouno as Mahiro Oyama (voice), Kaori Ishihara as Mihari Oyama (voice), Hisako Kanemoto as Kaede Hozuki (voice), Minami Tsuda as Momiji Hozuki (voice), Kana Yuuki as Asahi Ohka (voice), and Natsumi Hioka as Miyo Murosaki (voice).

Behind the camera, the score was composed by Alisa Okehazama, cinematography is by Akane Fushihara, and it was produced by Sosuke Asano and Hirotaka Kaneko.

Is ONIMAI: I'm Now Your Sister! worth watching?

ONIMAI: I'm Now Your Sister! holds an audience score of 7.5/10 from 62 ratings, marking it as well-reviewed animation series.

With 1 season and 12 episodes, it's a quick, bingeable run.

If you enjoy animation and comedy, ONIMAI: I'm Now Your Sister! is worth a place on your watchlist.

How and where to watch ONIMAI: I'm Now Your Sister!

In United States, you can stream ONIMAI: I'm Now Your Sister! on Crunchyroll and Crunchyroll Amazon Channel, or rent and buy it on Amazon Video. Click any service above to open it directly.

Streaming rights change country by country and month by month, so the options above reflect United States today — switch your country at the top of the where-to-watch section to see availability elsewhere.

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Cast of ONIMAI: I'm Now Your Sister!

Marika Kouno

Marika Kouno

Mahiro Oyama (voice)

Kaori Ishihara

Kaori Ishihara

Mihari Oyama (voice)

Hisako Kanemoto

Hisako Kanemoto

Kaede Hozuki (voice)

Minami Tsuda

Minami Tsuda

Momiji Hozuki (voice)

Kana Yuuki

Kana Yuuki

Asahi Ohka (voice)

Natsumi Hioka

Natsumi Hioka

Miyo Murosaki (voice)

ONIMAI: I'm Now Your Sister! — FAQs

Where can I watch ONIMAI: I'm Now Your Sister! in United States?

ONIMAI: I'm Now Your Sister! is streaming on Crunchyroll, Crunchyroll Amazon Channel in United States.

Is ONIMAI: I'm Now Your Sister! on Crunchyroll?

Yes — ONIMAI: I'm Now Your Sister! is currently available on Crunchyroll in United States.

What language is ONIMAI: I'm Now Your Sister! in?

ONIMAI: I'm Now Your Sister! is originally in Japanese. Subtitle and dub options vary by streaming service.

How many seasons of ONIMAI: I'm Now Your Sister! are there?

ONIMAI: I'm Now Your Sister! has 1 season with 12 episodes in total.

What is ONIMAI: I'm Now Your Sister! rated?

ONIMAI: I'm Now Your Sister! is rated TV-14. It holds a 7.5/10 audience score from 62 ratings.

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ONIMAI: I'm Now Your Sister! (2023) — where to watch online · SearchOTT