A Kiss That Stains the Innocence (manga)

Ombra is a rough type who lives alone in the mountains. One day a man asks him for help; prince Sirius, the son of the king and his concubine. It's been ten years since the king razed Ombra's village to the ground, killing his parents and anyone he's ever loved. Now he's consumed by emotions, conflicted by his desire for revenge and perhaps something else. Meanwhile Sirius, who can’t remember his past, doesn’t recognize Ombra’s internal struggle, only aware of his growing feelings for the man…