The strongest demon king in history returns from the dead and embarks on a grand adventure to find the god of all demons... and kill him! Hiram, the strongest demon king in history and ruler over all of demonkind, refused to obey the demon god's demand for sacrifices. A fierce battle ensued, which ended with Hiram losing his life. Five centuries later, Hiram successfully reincarnates himself as a young human with his magical powers and combat ability from his previous incarnation. He sets out on a journey to locate his adopted daughter, Philffy, as well as the Demon God, who is hiding somewhere in the world. After rescuing Lumiere, a royal elven princess, Hiram agrees to mentor her in the arts of magic. But soon, he gradually finds himself more and more entangled in a dark conspiracy brewing in the Kingdom of Orteville...