Watch OniAi

  • TV-MA
  • 2012
  • 1 Season
  • 5.9  (335)

OniAi is a Japanese anime series that was adapted by Silver Link and Connect studios from a light novel series that was written by Daisuke Suzuki. The anime series was directed by Keiichiro Kawaguchi and consisted of 12 episodes. It was first aired in Japan on October 5, 2012, and was later licensed by FUNimation Entertainment for distribution in North America.

The story revolves around the life of Akito Himenokouji, a high school student who had been living in an all-girls orphanage since he was young. The anime starts with Akito receiving a letter from his long lost twin sister, Akiko, who invites him to come and stay with her in Tokyo. After arriving in Tokyo, Akito is greeted by his sister and her two friends, Arisa and Anastasia, who are all in love with him.

As the story progresses, Akito is faced with the task of dealing with his sisters and their romantic advances. He is forced to navigate his way through the complicated relationships while trying to maintain his sanity. Along the way, the anime explores various themes such as love, family, and friendship.

Akiko, the younger twin sister, is portrayed as a playful and outgoing character who is in love with her brother. She is willing to do anything to get closer to him, going as far as putting on a maid outfit and setting up a tea party for two. Although she is portrayed as a bit of an airhead, Akiko is fiercely protective of her brother and will not hesitate to take down anyone who poses a threat to him.

Anastasia, on the other hand, is a half-Japanese, half-Russian girl who is also in love with Akito. She is portrayed as an intelligent and calculating character who is always looking for ways to get closer to Akito. She is the most level-headed of the three girls and often acts as a mediator between Akiko and Arisa.

Arisa is a childhood friend of Akito's and is portrayed as a slight tsundere character who is in love with him. She is often seen bickering with Akiko and Anastasia over who gets to be with Akito. Despite her tough exterior, Arisa is shown to have a kind and caring side, especially towards Akito.

The anime also features other characters such as Ginbei Haruomi Sawatari, another childhood friend of Akito, who has a crush on him. She is portrayed as a calm and composed character who often acts as a voice of reason in the group. There is also Kaoruko Jinno, a teacher at the school who is in love with Akito. She is portrayed as a mature and confident character who is not afraid to pursue Akito.

Overall, OniAi is a lighthearted romance anime that explores the complex relationships between a brother and his three sisters. The anime features a colorful cast of characters that are all unique in their own way. The anime also features a good balance of comedy and drama, making it an enjoyable watch for fans of the romance genre.

OniAi is a series that is currently running and has 1 seasons (12 episodes). The series first aired on October 4, 2012.

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It's Love
12. It's Love
December 20, 2012
Everyone gets separated and Akiko is left alone with Nasuhara. While contemplating her panty dilemma, Nasuhara reminisces about her first meeting with Akiko. What will happen to Akito and his crew of crazy girls that sleep under the same roof?
11. Fleeting
December 13, 2012
Unable to find her panties, Anastasia decides to go commando for the rest of the day. Arisa gets frightened by something she sees outside of the dorm and the group decides to investigate the source. All the while, Kaoruko sleeps in a feverish slumber.
Silver Ball
10. Silver Ball
December 6, 2012
During her turn nursing, Ginbe reminisces about Akito's transfer to her school and how they first met. After Akito recovers he has to choose the winner of the contest he had no idea about. What is the prize and what will the winner do with such a chance?!
Meow Meow
9. Meow Meow
November 29, 2012
Akito follows Gin to the back of the school building to find out why she is acting so suspiciously. When Akito suddenly falls sick, everyone fights over who will nurse him back to health. They decide to take turns treating him how they see fit.
8. Colorful
November 22, 2012
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 off their new goods and Akito must decide which one impresses him the most.
7. Petitties
November 15, 2012
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.
6. Mayochiki
January 8, 2012
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.
5. Erogeny
November 1, 2012
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.
4. Naked
October 25, 2012
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.
3. Braless
October 18, 2012
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.
2. Indecency
October 11, 2012
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.
1. OniAi
October 4, 2012
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?
Where to Watch OniAi
OniAi is available for streaming on the FUNimation website, both individual episodes and full seasons. You can also watch OniAi on demand at Amazon Prime.
  • Premiere Date
    October 4, 2012
  • IMDB Rating
    5.9  (335)