 If you liked
Karas
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 ...then you might like
Kishin Houkou Demonbane (TV)
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This two animes are similar in many ways, both main character have a contract between Yurine from Karas and Azif Al from Demonbane which give powers when they stay togheter. There is a evil organization in both anime who want to destroy the town or world and the ending is almost same.