ONIMAI: I'm Now Your Sister!
お兄ちゃんはおしまい！
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.
Ratings
Based on audience scoresWhere to stream ONIMAI: I'm Now Your Sister!
Streaming now in the United States on Crunchyroll.
Rent or buy in the United States on Amazon Video.
Trailers and promos
Promotional Video [Subtitled]
Official Trailer [Subtitled]
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Frequently asked questions about ONIMAI: I'm Now Your Sister!
Where can I watch ONIMAI: I'm Now Your Sister! in the United States?
ONIMAI: I'm Now Your Sister! is available to stream on Crunchyroll in the United States, and to rent or buy on Amazon Video. Streaming availability is provided by JustWatch and can change over time.
Can I watch ONIMAI: I'm Now Your Sister! for free?
Not free in the United States right now. ONIMAI: I'm Now Your Sister! needs a subscription to Crunchyroll, or you can rent or buy it on Amazon Video.
What are the ratings for ONIMAI: I'm Now Your Sister!?
ONIMAI: I'm Now Your Sister! scores 7.4 on The Movie Database.
Who stars in ONIMAI: I'm Now Your Sister!?
ONIMAI: I'm Now Your Sister! stars Marika Kouno, Kaori Ishihara, Hisako Kanemoto, Minami Tsuda, and Kana Yuuki.
How many seasons of ONIMAI: I'm Now Your Sister! are there?
ONIMAI: I'm Now Your Sister! has 1 season and 12 episodes, and is ended.
How long does it take to watch all of ONIMAI: I'm Now Your Sister!?
All 12 episodes of ONIMAI: I'm Now Your Sister! add up to about 4 hours 48 minutes at roughly 24 minutes each. At two hours a night that is about 2 evenings; at four hours a day it takes about 1 days.
What network is ONIMAI: I'm Now Your Sister! on?
ONIMAI: I'm Now Your Sister! airs on AT-X, and is produced by Studio Bind, EGG FIRM, and Ichijinsha.
What language is ONIMAI: I'm Now Your Sister! in?
ONIMAI: I'm Now Your Sister! is in Japanese, and its original title is お兄ちゃんはおしまい！.
Ratings and streaming availability are aggregated from third-party sources; metadata from The Movie Database (TMDB), streaming data from JustWatch. This product uses the TMDB API but is not endorsed or certified by TMDB. Streaming availability checked September 2026.