Ryuui Azemane,He was a demon who lived in the AD era in Japan and because he was very powerful he could live for thousands of years. He is more than 2000 years old but her face and body are still young and lives alone in a remote mountain in Japan in a wooden house that is not very large. He is very powerful because he used to study black magic and even ate humans, but now he doesn't eat humans anymore and lives a lonely life and even disguises himself as an ordinary human to go to city