ONIMAI: I'm Now Your Sister!

Name: ONIMAI: I'm Now Your Sister!
Genre: Animation, Comedy
Released: 2023-01-05
Rating: 7.5
Cast: Marika Kouno, Kaori Ishihara, Hisako Kanemoto, Minami Tsuda, Kana Yuuki

2023·Series·TV-14·24 min·★ 7.5(62)

Animation Comedy More Japanese titles

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

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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?

Country	Streaming on	Rent / Buy
United States	Crunchyroll, Crunchyroll Amazon Channel	Amazon Video
United Kingdom	Crunchyroll, Crunchyroll Amazon Channel	—
Canada	Crunchyroll Amazon Channel, Crunchyroll	—
Australia	Crunchyroll, Crunchyroll Amazon Channel	—
Germany	Aniverse Amazon Channel	Akibapass
France	Amazon Prime Video, Animation Digital Network, Anime Digital Network Amazon Channel, Amazon Prime Video with Ads	Amazon Video
Brazil	Crunchyroll, Crunchyroll Amazon Channel	—
Japan	Hulu, U-NEXT, Anime Times Amazon Channel, dAnime Amazon Channel	Amazon Video
South Korea	Watcha	—

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.