Halos and Horns is a comic based on the Containtine 2005 movie.
 

An angel and an exorcist walk into a bar- The angels name is Selene and the Exorcist is Millie. They fight ghosts and extraterrestrial monters. 

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After escaping hell and becoming an Exorcist, Millie helps out the humans get rid of demons and other bad creatures on Earth. Then a fallen angel lands in her lap. She has to take care of her and show this Rebel how to live in the human world and harness her angel powers.