Aki Sora: Yume no Naka

Also known as:  Autumn Sky: In My Dreams, Aki Sora OVA 2, Autumn Sky OVA 2

Following the first Aki Sora OVA at the end of 2009, Aki Sora: Yume no Naka is the second anime project based on Masahiro Itosugi's "line-crossing" ecchi / incest manga about the taboo relationship between a high school boy named Sora Aoi and his smart, athletic, "perfect" older sister Aki. This two-episode OVA is once again adapted by studio Hoods Entertainment.

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Producers, official website and other details: AniDB, ANN, Wiki