OniAi poster

OniAi

2012 Animation, Comedy, Romance 1 season

TMDB rating 6.5/10 Ended

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!

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Seasons1

  • 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.

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Cast and details

  • Ryota OsakaAkito Himenokoji (voice)
  • Ibuki KidoAkiko Himenokoji (voice)
  • Minori ChiharaAnastasia Nasuhara (voice)
  • Asami ShimodaGinbei Haruomi Sawatari (voice)
  • Eri KitamuraArashi Nikaido (voice)
Created by
Daisuke Suzuki
Network
AT-X
First aired
Oct 5, 2012
Latest episode
Dec 21, 2012

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Release dates are original schedules and may differ from availability in your country. A release never marks anything as watched. Last checked Nov 2, 2026.Schedule data from TVmaze, CC BY-SA.