 If you liked
Uta∽Kata
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 ...then you might like
Mahou Shoujo Kazumi★Magica: The Innocent Malice
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Uta Kata and Puella Magi Kazumi Magica are two seinen manga series about a girl who gets involved with magic and can transform into a magical girl as a result. Kazumi Magica is longer, but both series are much darker than at first sight, and have similar levels of fan-service.