In addition to Akiko, several other girls wind up vying for the closest place within Akito's heart. Despite the show's incestuous title and undertone, it's eventually revealed that Akito is actually adopted but kept the information a secret to taunt Akiko. However, as time passes, Akiko's feelings for her brother intensify beyond what is socially acceptable feelings which are not even reciprocated by Akito who only cares for her like an older brother does for his little sister. The high-school-age brother and sister, who have lived apart for six years from the moment their parents died, are reunited when Akiko decides she wants to return to some sense of familial bonding. The plot of this anime revolves around twin siblings Akito and Akiko Himinekoji. 'OniAi' is the shorthand name for the 12 episode harem anime series known as 'Onii-chan dakedo Ai sae Areba Kankeinai yo ne!' which means 'As Long as There's Love, It Doesn't Matter If He is My Brother, Right!' OniAi is based off its source manga (or Japanese comic book), is directed by Keiichir? Kawaguchi, is produced by Studio Silver Link, and licensed for American distribution by Funimation.

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