Aki-Sora

Sora Aoi grows up extremely close to his older sister Aki and his twin Nami, but over time his feelings for Aki become something he can no longer understand as ordinary sibling affection. When Aki admits that she feels the same way, the two enter a secret relationship they know others would not easily accept.

Nami remains unaware of what is happening and meanwhile tries to bring her friend Kana closer to Sora, making the relationships around the siblings increasingly complicated. The story centers on the emotional and family tension created by a forbidden relationship that cannot be openly acknowledged, and on the choices people make when personal desire collides with social and familial boundaries.