Juuhime: Phantom Pain

Zao Ci, a timid and weak boy, is taken in by Mateliya, a demon who names him her second-in-command. Despite her frequent insults, calling him an idiot, Mateliya recognizes something unique in him—hidden power that only she can control. Though he struggles with basic tasks, such as pulling a gun trigger, his latent ability sets the stage for a journey. Together, they embark on a mission to help others, bound by their agreement.