 If you liked
Neo Angelique Abyss: Second Age
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 ...then you might like
07-Ghost
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Neo Angelique is shoujo while 07 Ghost is shounen, although they share many similar things: the main character is the key to save the world, and is protected by many guys. There´s also in both, characters being possessed by evil beings all the time, including one of the best friends of the main chara. Also, there´s a Sanctuary\ church in both, that helps the main character.