Aneimo.

Takashi lives a quiet life with his older sister, who has always been protective of him. Their bond is close, but as they grow older, the boundaries between sibling affection and something more begin to blur. Takashi finds himself increasingly drawn to his sister in ways that challenge their relationship.

When their parents leave for a trip, the siblings are left alone at home. The solitude amplifies their hidden desires, leading to a series of intimate encounters that test the limits of their connection. As they navigate these forbidden feelings, they must decide whether to embrace their emotions or maintain the facade of a normal sibling relationship.