TV-MAAT-X6.4(24)

OniAi

Name: OniAi
Director: Keiichiro Kawaguchi
Genre: Animation, Comedy, Romance
Released: 2012-10-05
Rating: 6.4

お兄ちゃんだけど愛さえあれば関係ないよねっ

AnimationComedyRomance

Watch Free

We checked 8 streaming services in India on 21 May 2026 at 00:17 IST

2012

1 Season

12 Episodes

Ended

TV-MA

About

Adorable young Akiko is thrilled to be reuniting with Akito, the handsome older brother she hasn’t seen in years! In fact, she might be a little too excited about living under the same roof with her precious big bro. This pint-sized cutie has a serious brother complex, and she’s definitely not interested in sharing his attention. Unfortunately for little sister, she and Akito won’t be living alone: three gorgeous girls from the student council will be along for the ride! So much for the peaceful existence Akito was craving. Big Brother the dreamy will have to stay on his toes to avoid the advances of Sis and her ravishing rivals!

#forbidden love#high school#harem#school#school life#ecchi#anime#japanese high school

Cast

Ryota Osaka

as Akito Himenokoji (voice)

Ibuki Kido

as Akiko Himenokoji (voice)

Minori Chihara

as Anastasia Nasuhara (voice)

Asami Shimoda

as Ginbei Haruomi Sawatari (voice)

Eri Kitamura

as Arashi Nikaido (voice)

Seasons

Season 1

12 episodes2012

After 6-years' separation, Himenokouji Akito reunites with his twin sister Akiko and they live together once more. However, in the interim, Akiko had developed a serious case of bro-con, romantic feelings for Akito. It doesn't stop there as Nikaidou Arashi, the student council president of his new school, vice-president Nasuhara Anastasia, and Sawatari Ginbei Haruomi, who followed Akito all the way from Kyoto, all move in with him one after the other.

Episodes

Season 1

See all 12episodes →

Brother Love

Oct 5, 201225m

Akiko moves into a school dormitory with her brother Akito, when he transfers to her school. Owing to her brother complex, Akiko has a crush on Akito. With both of them in student government, will Akiko be able to share him with the other council members?

Indecent

Oct 12, 201225m

Akito catches Akiko reading a trashy romance novel. Akito, having trouble settling in to in his class, is given firsthand lessons in the concept of "tsundere"from both Akiko and Anastasia. Akito and his longtime friend Ginbe get into an argument.

No Bra

Oct 19, 201225m

Akiko asks Akito for help changing her light. Akito has his hands full maintaining the dorm, from fixing the plumbing to repairing the doors. The girls have differing opinions over allowing Akito to take in the laundry. Akito helps Anastasia settle in.

Naked

Oct 26, 201225m

Akito brings home a special dessert, just for Ginbe to enjoy. Akito continues to fix up Anastasia's room, and the two of them discuss her hobby of collecting stuffed animals. Arashi has the girls take a bath together, to help them bond together better.

Sexual desires

Nov 2, 201225m

In a student government meeting, the council members discuss what they are going to call Akito. Kaoruko proposes that Akito write a short story to be published in a women's magazine. She grows concerned for him when she learns his sibling is a sister.

Mayonnaise & chicken

Nov 9, 201225m

Kaoruko reads the latest installment of Akito's love story. She decides to stop by the dorm, where she meets the others, and asks them whether they think Akito has a sister complex. The council decides to separate Akito and Akiko into separate rooms.

Chippai

Nov 16, 201225m

Akiko is upset over not being consulted before Arisa, who claims to be Akito's fiancée, was hired as dorm manager. Later that day, Arashi proposes that Akiko and Arisa compete in a contest, to see which one of them is the better little sister to Akito.

Colorful

Nov 23, 201225m

The girls all go to find new swimsuits even though summer is still in the distance. They try frilly ones, sexy ones, and cute ones. Then, Arashi proposes a contest to show of their new goods and Akito must decide which one impresses him the most.

Where does OniAi rank today?

OniAi is #2348 on the CineFlixo Daily Streaming Charts today.

Highest: #2348
Top 10: 0 days
Top 100: 0 days

Watch OniAi Online Free — All Episodes in HD

Stream OniAi online free in HD on CineFlixo. A popular animation, comedy, and romance series originally produced in Japonés and released in 2012, it's earned a solid 6.4/10 from 24 viewers worldwide.

About OniAi

OniAi Cast and Characters

The cast features Ryota Osaka (as Akito Himenokoji (voice)), Ibuki Kido (as Akiko Himenokoji (voice)), Minori Chihara (as Anastasia Nasuhara (voice)), Asami Shimoda (as Ginbei Haruomi Sawatari (voice)), and Eri Kitamura (as Arashi Nikaido (voice)). Their performances are a major reason OniAi has built such a passionate audience.

Where to Watch OniAi Online

On CineFlixo you can watch OniAi 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 OniAi Now

Why People Are Watching OniAi

OniAi flies under the radar but it deserves your attention. What makes it work is sharp comedic timing that lands consistently and chemistry between leads that actually feels real. 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 OniAi

Where can I watch OniAi online for free?

You can watch OniAi 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 OniAi have?

OniAi has 12 episodes across 1 season. All episodes are available to stream right here on CineFlixo.

Is OniAi good? What's the rating?

OniAi holds a 6.4/10 rating based on 24 reviews — a solid pick if the genre interests you.

Who is in the cast of OniAi?

The main cast includes Ryota Osaka, Ibuki Kido, Minori Chihara, and Asami Shimoda, plus a strong supporting ensemble.

Is OniAi available in Japonés?

Yes — OniAi was originally produced in Japonés and that's the version you'll stream here on CineFlixo. English subtitles are provided when available.

When was OniAi released?

OniAi first aired in 2012.

Do I need an account to watch OniAi on CineFlixo?

No. CineFlixo is free and you can watch OniAi 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 OniAi, check out Lovely★Complex, Amazing Stranger, Strike Witches: 501st JOINT FIGHTER WING Take Off!, My Wife is a High School Girl, and Strange Days at Blake Holsey High.

Frequently Asked Questions

Where can I watch OniAi for free?

You can watch OniAi 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 OniAi have?

OniAi 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 OniAi about?

In which language is OniAi originally available?

OniAi 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 OniAi first released?

OniAi first premiered on October 5, 2012 (2012). The series has since concluded its run.