Naraku no Adu  

Adu of Hades, ナラクノアドゥ

Adu is not an ordinary human being; instead, he's one of the 12 most powerful demon kings who made a pact with an angel. this agreement allowed him to manifest into a human body in the real world under one condition: he must hunt down and eliminate all other demon kings. although adu is incredibly strong, becoming more human-like has weakened his demonic abilities. his journey involves seeking out and destroying the remaining demon kings while safeguarding humanity from their malevolent influence. despite this, adu conceals his dark secret from others to protect them.