Akaza is a major supporting antagonist of Demon Slayer: Kimetsu no Yaiba. He is a demon affiliated with the Twelve Kizuki, holding the position of Upper Rank Three.Over a century ago, Akaza was a human by the name of Hakuji. a prodigious martial artist who trained under Keizo, a martial arts instructor who took him in as a student, while nursing his daughter, Koyuki,who would later become Akaza's fiancée. Akaza hates douma/doma because he eats woman