who is Ai Enma?

I'm sorry but this is the Sebastion Michaelis club.

Please don't ask non-related Sebby/Sebastian/Bassy question on the Sebastian Michaelis club, thank you.

Yes this is the Sebastian Michaelis club... You can find out who she is just by typing her name into google. She is from Jigoku Shoujo/ Hell Girl. It's an interesting anime, check it out.