 If you liked
Mahou Shoujo Madoka★Magica
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 ...then you might like
Kami nomi zo Shiru Sekai II
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They are both about bad spirits which are attracted to negative energy that need to be gotten rid of in a supernatural sense, and in both series' they reside inside people. However, Kami nomi is more light-hearted and cute, whereas Madoka is darker and a lot 'deeper' than Kami nomi.