Siblings Aki and Sora Aoi have been in a secret relationship ever since they confessed their feelings to each other on a rainy day. Sora's twin sister Nami—unaware that his affections lie elsewhere—decides to have him join the Fashion Research Club at school in an attempt to set him up with their classmate, Kana Sumiya. However, Nami's actions mask painful truths. While her motives appear like those of a good sister trying to help her brother finally get a girlfriend, she is harboring secret, forbidden feelings of her own.

Aki-Sora: Yume no Naka was released on DVD and Blu-ray by Kitty Media on May 24, 2013 and January 30, 2018 respectively. The OVA was later bundled alongside Kanojo x Kanojo x Kanojo: Sanshimai to no DokiDoki Kyoudou Seikatsu in the Blu-ray and DVD versions of Kitty Media's Double-Disc Delight, released on February 4, 2020.