Dark Prince vol. 1 (Yaoi manga)

Prince Davon murders boys whose name start with the letter “A.” The loyal retainer Lowry is summoned by the king to put a stop to it. Lowry assumes the prince is insane due to inbreeding. As he investigates he learns of Davon’s dark religion, and of the god Davon claims is his lover. Is this dark god who commands Davon to kill even real? Lowry seeks answers from Davon’s brother Lor, but he can scarcely rely on him when he’s also claiming to be Davon’s lover.