According to the official website, an anime adaptation of Suzuki Daisuke’s harem-comedy light novel series, 「Onii-chan dakedo Ai sae Areba Kankei nai yo ne」 (As Long as There’s Love, It Doesn’t Matter If He is My Brother, Right), was green-lit for production.
The Onii-Ai LN series currently has 5 volumes to date – with the first volume debuting on December 31st, 2010. A manga adaptation was serialized in Monthly Comic Alive magazine since October of last year.
After being separated from each other for 6 years since the death of their parents, fraternal twins Akito Himonokouji (brother) and Akiko Himonokouji (sister) had finally reunited together again during the holidays thanks to some planning from Akito, despite objections from both of their adoption families. Being happy that Akito had fulfilled his promise to be with her again, Akiko confessed readily that she had incestuous love in Akito, and will not hesitate to do anything to win the love of Akito. Akito however does not harbor the same feeling for Akiko, and as a result had a headache with Akiko’s actions. Despite all these, he still loves Akiko as a sister, and finds her adorable and cute, especially when he had not seen her since she was 10 years old.