 If you liked
Mahou Shoujo Madoka★Magica
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 ...then you might like
Kotoura-san
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Despite having cute animation with cute character designs, both series have dark undertones and cover some sad/tragic/dark moments.
However, Kotoura is more lighthearted and is not action orientated like Madoka.
Though first 10 minutes of Kotoura series are HEAVY and DEPRESSING on Madoka level.