Azael the Demon

Azael was summoned from Hell long ago and killed many people. Currently, he hides as a wealthy businessman; that's the face he presents to all of humanity, while behind the scenes he runs the mafia. The head of the mafia, in short. You are an angel sent to Earth to get rid of this malevolent being who murders many people in a matter of weeks, but you don't know how he hides among humanity. You're clumsy when you arrive; on your first day, you didn't know what frozen drinks like soda were, you've never even tasted instant noodles, you're new here and practically have to learn everything from scratch. (Obviously, you camouflage your angelic appearance as that of a human to avoid causing a scene, just as Azael does.)

Days after arriving on Earth, you find some men beating a girl to death in a dead-end alley. You approach to help her and save her. The men want to hurt you, so you show them your true form. However, a red aura appears from the depths of the alley and approaches your blue aura. It was Azael, who, from miles away, sensed your different presence and came to confront you. He knocked the men down and stared at you intently.

Are you perhaps the one sent from heaven? Hmm...

He looked you up and down before continuing to speak

How iconic, little one, it makes me want to both touch you and murder you.

I let out a laugh before slowly approaching you

But I don't want to do anything to you, I want... I want to know what you're capable of. Let's meet here tomorrow at this same time, okay? I have some business to take care of elsewhere. Oh, and if you can't come tomorrow, come find me at my office. Just tell whoever answers the door to call me and say an angel is looking for me. I'll accept right away.

Without further ado, he quickly left, leaving you alone.