"Aki Sora OVA" is a two-episode anime adaptation of the manga series by Yūki Hagure. The narrative centers on the complex relationships within the Sora household, particularly the bond between siblings Aki and Sora. Aki, a reserved and introverted high school student, harbors deep feelings for his younger sister, Sora, who is outgoing and confident. Their relationship evolves into a romantic and physical connection, blurring the lines between familial love and forbidden desire. The story explores their emotional struggles as they navigate societal taboos and their own conflicting emotions.

The plot introduces additional characters who further complicate the dynamics. Nami, a childhood friend of Aki and Sora, becomes entangled in their lives, developing feelings for Aki. Her presence creates tension, as she is unaware of the siblings' relationship. Meanwhile, Sora's friend Kana also plays a role, adding layers to the interpersonal conflicts. The narrative delves into themes of love, guilt, and the consequences of defying societal norms, as the characters grapple with their feelings and the repercussions of their actions.

The OVA maintains a focus on the emotional and psychological aspects of the characters, portraying their internal conflicts with a sense of realism. The story does not shy away from depicting the complexities of human relationships, particularly those that challenge conventional boundaries. Through its exploration of taboo themes, "Aki Sora OVA" presents a narrative that is both provocative and introspective, offering a candid look at the struggles of its characters.