Otaku and reclusive, her older brother tends to get aggressive and spew insults while playing FPS games, which leads him to pick a fight with the son of a powerful yakuza boss. As a result, the gangsters storm their home and target his younger sister, Hinori, instead. Forced to submit in front of her brother, she is made to serve them sexually even during meals, her heart torn apart emotionally. Yet her young, sensitive body gradually succumbs to pleasure, climaxing repeatedly. As she becomes increasingly obedient, her brother struggles with anger and confusion, yet finds himself drawn deeper into a twisted relationship with her. What lies ahead is a shocking, complex conclusion where love and hatred collide.