Ever since he was a young child, Sora Aoi had always exchanged words of "I love you" with his attractive older sister Aki.

However, Sora soon finds himself exploring many forms of love with different kinds of women he met that is not accepted by society thus questioning his feelings for his sister.

The Aki Sora manga, written and drawn by Masahiro Itosugi, was serialized in Akita Shoten's Champion Red Ichigo magazine between September 5, 2008 and April 5, 2011.

The individual chapters are collected and released by Akita Shoten in six bound volumes between December 19, 2008 and May 20, 2011.

He further comments, "While we get a fair bit of upper body nudity, there’s no genitalia involved for those that are looking for that aspect of it ... it’s not hiding the sex, but it’s also straddling the line in a way to try to appeal to more people while not going all hardcore.