Aki-Sora revolves around Aki Aoi
and Sora Aoi
, a pair of close siblings who have shared an intimate bond since childhood. During their coming of age, they each come to realize the true depth of the love they feel for each other and consummate that love in secret. They keep their younger sister, Nami, Sora’s twin in the dark about their new relationship. Nami, clueless of what is happening in her household aims to set her brother up with her best friend, Kana Sumiya
. Despite these relationships, Nami seems to have feelings for someone near to her too but keeps them secret.
Aki lives a charmed life. Popular, athletic, and at the top of her class, she rules the school; and at home, her younger brother Sora caters to her every whim. However, her younger sister Nami doesn’t have it so easy. The small-chested and sarcastic girl is in love with her best friend, who happens to be in love with Sora. Meanwhile, the slight and feminine Sora spends his evenings cooking and cleaning for the entire family while being bullied by Aki – and what’s worse, he harbors a forbidden, deep-seated lust for the girl. Will Sora give into his desires, and will Nami ever win the heart of her best friend?