1 ASOIAF: I Am Rhaegar! A modern man died and was reborn in the Demon Slayer world as Mitsuri Kanroji's younger brother. Knowing the canon, he trained. Trained hard enough to impress Kokushibo, who had turned him into a demon, trained him in moon breathing, and made him fight until he reached the upper moon ranks. But he died during the final battle, turning against Muzan after his master's death and