OniAi (which is also known as Onii-chan dakedo Ai sae Areba Kankeinai yo ne!) is an anime series based on a light novel series written by Daisuke Suzuki and illustrated by Gekka Uru.

The series begin with a brother and sister named Akito and Akiko Himenokoji reuniting after being apart for six years; unfortunately, in the first episode of the anime series, it's never truly explained why the two were separated in the first place. It turns out that Akiko has a "big brother" complex, and has decided that she wants to have more than a sibling relationship with Akito.

Unfortunately for Akiko, they share a dorm with three female students, all of whom are interested in Akito: blond-haired Anastasia Nasuhara, Ginbee Haruomi Sawatari (who looks more like a boy than a girl), and Arashi Nikaido (who wears an eyepatch and carries a katana around). All of the characters are members of Saint Liliana High School's student council.

OniAi is definitely aimed at a very particular segment of anime fandom, and it's a segment that I'm not part of. Unfortunately, I really couldn't find anything that I particularly liked about this series. I thought that Akiko was a very annoying character, and I found myself wishing that Arashi would smack her with the katana that she carries around. Unfortunately, so much emphasis was put on Akiko in the first episode, I really wasn't able to form much of an opinion on the other girls in Akito's "harem." Ultimately, OniAi is taking the harem concept and including a little sister with a "big brother" complex as part of the harem.

When it comes to the animation content of the series, there were a few shots with hinted at nudity. However, nothing blatant was actually shown onscreen. The quality of the animation itself wasn't bad, but it really had nothing to make it stand out from other similar anime series that have been released in recent years.

Ultimately, OniAi will only appeal to the audience that already has an appreciation for many of the similar anime series that have already been released. If you don't have any kind of interest in anime featuring harems or sisters with "big brother" complexes, then OniAi is probably a series you should avoid.

Since FUNimation Entertainment is only making the streams of the episodes available to viewers who are 17 and up, I can only truly recommend OniAi to anime viewers who are 17 or 18 years of age and older.

Title	Episodes	Release Year(s)	Director	Studio	N.A. Licensor
OniAi	12	2012	Keiichiro Kawaguchi	Silver Link	FUNimation Entertainment