ONIMAI: I'm Now Your Sister!
お兄ちゃんはおしまい！
We checked 8 streaming services in India on 04 Jun 2026 at 15:02 IST
About
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.
Cast
Seasons
Episodes
Season 1
Mahiro's Confusing New Body
We follow Mahiro Oyama, an unemployed good-for-nothing shut-in, who not only hasn't left the house in two years, but is also exceedingly addicted to gross video games. One afternoon, he wakes up and notices that his body feels a little off. Finding that strange, he goes to reach for his tablet, but what does he see in his reflection, but an adorable young lady. I wonder what lies in store for the "former" big brother, Mahiro as he's thrust headfirst into his new life as a girl.
Mahiro's Time of the Month
As Mahiro stumbles through his new life as a girl, he finds himself gradually beginning to get into the swing of things. Realizing this, however, prompts him to try and reclaim some of his masculinity. He tries, in futility, to engage his core and do a sit-up, but ends up with a stomachache instead. Seeing his condition worsen rapidly before her eyes, Mihari has an epiphany. She realizes that his pain may actually have something to do with fact that almost a month has passed since Mahiro turned into a girl...
Mahiro's Close Encounter
Mahiro makes a mad dash for the bathroom, but when he opens the door, he finds the facilities are already occupied by a high school girl he's never met. This bold fashionista turns out to be Kaede, Mihari's old classmate from middle school. Mahiro is initially a little nervous around her, but as he gets to know her, he learns how much of a nice person she is and becomes quite attached to her. Then, out of nowhere, Kaede asks "You've never done it before, have you?" and begins to scooch closer to a puzzled Mahiro. I wonder what she's about to do next...
Mahiro's New Friend
Mahiro loses to Mihari in a video game, so he has to do the grocery shopping this week as punishment. As an unemployed, good-for-nothing shut-in, the task at hand is daunting, but he plucks up the courage and makes his way towards the supermarket. The size of the crowd, however, makes his resolve waver and Mahiro finds himself cowering outside the store entrance. It is then that a young boy (?) around his age, wearing a baseball cap, comes to the rescue and offers him a helping hand. Thanks to the boy's (?) help, Mahiro is able to buy the groceries he needs and is just about to head home, when Kaede suddenly shows up. Seemingly, out of nowhere.
Mahiro Discovers Adventure and Social Gatherings
In a rare turn of events, Mihari wakes up one morning to find Mahiro has gotten up before her. Since the corner store was going to start selling clear files from his favorite anime that day, he had woken up early to go pick them up before they sold out. Mihari is overwhelmed with joy to see Mahiro going outside of his own accord. On his way back from buying the clear files, Mahiro stops by an arcade for the first time since middle school. He's enjoying a rhythm game when suddenly he senses a man standing watching him from behind. A few minutes go by when he feels a tap on the shoulder...
Mahiro Goes Back to Middle School
Momiji shows up at Mahiro's house with her two classmates, Asahi Ohka and Miyo Murosaki, to invite him out for parfaits.
Mahiro's Role-Playing Game
Just when Mahiro is beginning to get used to middle school life again, finals are upon them. Despite his initial blasé attitude, Mahiro finds himself reluctantly handing in a 80% blank answer sheet after having slept through the entire first exam.
Mahiro's First Girls Sleepover
It's finally winter break and Mahiro is excited to get into his Winter Vacation Mode. Unbeknownst to him, however, Mihari invites Momiji and the others over for a sleepover. She hopes this will prevent a potential relapse into his old, shut-in ways.
Where does ONIMAI: I'm Now Your Sister! rank today?
ONIMAI: I'm Now Your Sister! is #475 on the CineFlixo Daily Streaming Charts today.
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Watch ONIMAI: I'm Now Your Sister! Online Free — All Episodes in HD
Stream ONIMAI: I'm Now Your Sister! online free in HD on CineFlixo. A well-rated animation and comedy series originally produced in Japonés and released in 2023, it's earned a solid 7.4/10 from 60 viewers worldwide.
About ONIMAI: I'm Now Your Sister!
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. Across 1 season and 12 episodes, originally airing on AT-X.
ONIMAI: I'm Now Your Sister! Cast and Characters
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)), and Kana Yuuki (as Asahi Ohka (voice)). Their performances are a major reason ONIMAI: I'm Now Your Sister! has built such a passionate audience.
Where to Watch ONIMAI: I'm Now Your Sister! Online
On CineFlixo you can watch ONIMAI: I'm Now Your Sister! free — no account, no credit card, no ads in the middle of the show. We stream the full series in 720p / 1080p HD, with subtitles when available, on any device: phone, tablet, laptop, or smart TV browser.
▶ Watch ONIMAI: I'm Now Your Sister! NowWhy People Are Watching ONIMAI: I'm Now Your Sister!
ONIMAI: I'm Now Your Sister! flies under the radar but it deserves your attention. What makes it work is sharp comedic timing that lands consistently. If you enjoy Japonés storytelling that doesn't follow the same tired beats, this is the kind of show you'll end up recommending to friends.
Frequently Asked Questions about ONIMAI: I'm Now Your Sister!
Where can I watch ONIMAI: I'm Now Your Sister! online for free?
You can watch ONIMAI: I'm Now Your Sister! online free on CineFlixo. Just open the page and hit play — no signup, no subscription, full HD streaming on phone, tablet, or desktop.
How many episodes does ONIMAI: I'm Now Your Sister! have?
ONIMAI: I'm Now Your Sister! has 12 episodes across 1 season. All episodes are available to stream right here on CineFlixo.
Is ONIMAI: I'm Now Your Sister! good? What's the rating?
ONIMAI: I'm Now Your Sister! holds a 7.4/10 rating based on 60 reviews — well above average.
Who is in the cast of ONIMAI: I'm Now Your Sister!?
The main cast includes Marika Kouno, Kaori Ishihara, Hisako Kanemoto, and Minami Tsuda, plus a strong supporting ensemble.
Is ONIMAI: I'm Now Your Sister! available in Japonés?
Yes — ONIMAI: I'm Now Your Sister! was originally produced in Japonés and that's the version you'll stream here on CineFlixo. English subtitles are provided when available.
When was ONIMAI: I'm Now Your Sister! released?
ONIMAI: I'm Now Your Sister! first aired in 2023.
Do I need an account to watch ONIMAI: I'm Now Your Sister! on CineFlixo?
No. CineFlixo is free and you can watch ONIMAI: I'm Now Your Sister! without creating an account. Sign-up is optional — only useful if you want a personal Watchlist or to comment on episodes.
Similar Series You Might Like
If you enjoyed ONIMAI: I'm Now Your Sister!, check out Photokano, Problem Children Are Coming from Another World, Aren't They?, Bosco Adventure, Trailer Park Boys: The Animated Series, and Araiya-san! Ore to Aitsu ga Onnayu de!?.
Frequently Asked Questions
Where can I watch ONIMAI: I'm Now Your Sister! for free?
You can watch ONIMAI: I'm Now Your Sister! online for free on CineFlixo. All 12 episodes across 1 season are available to stream in HD without a subscription, signup, or paywall. Just open the show page and press play.
How many seasons and episodes does ONIMAI: I'm Now Your Sister! have?
ONIMAI: I'm Now Your Sister! currently has 1 season and a total of 12 episodes. The series status is "Ended", so the episode count may grow as new seasons are released. You can browse the full episode list on CineFlixo and continue watching from where you left off.
What is ONIMAI: I'm Now Your Sister! about?
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. It belongs to the Animation, Comedy genres.
In which language is ONIMAI: I'm Now Your Sister! originally available?
ONIMAI: I'm Now Your Sister! was originally produced in JA. On CineFlixo the show is available in its original JA audio. Check the player options on the watch page for available subtitle tracks.
When was ONIMAI: I'm Now Your Sister! first released?
ONIMAI: I'm Now Your Sister! first premiered on January 5, 2023 (2023). The series has since concluded its run.
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