Onee-chan no Nikubenki

Yuu, a high school student, lives with his older sister, who has always been kind and protective of him. Their relationship takes a dark turn when she begins to use him as a tool for her own sexual gratification, turning their home into a place of twisted desire and control.

As Yuu struggles with confusion and shame, he finds himself trapped in a cycle of abuse and dependency. The story explores the disturbing dynamics of their bond, where affection and manipulation become indistinguishable, leading to a harrowing conclusion.