 If you liked
Mai-HiME
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 ...then you might like
Senki Zesshou Symphogear
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They both are about girls who acquire magical powers and use these powers to fight monsters. Mai-hime has a much larger character cast though and is more about magic and mecha monsters as power whereas Symphogear is about music and has more science fiction. Mai-Hime is much stronger all around, but they are still similar in many ways.