 If you liked
Mahou Shoujo Madoka★Magica
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 ...then you might like
Yakusoku no Neverland
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The Promised Neverland and Puella Magi Madoka Magica are two manga series that feature a female character in the lead role and seem to start off innocently. After the fate of another character, the plot is revealed to be a more mature story where the characters realize the dangers they're put in and that they are being used for others' benefit. These series are not meant for a younger/sensitive audience, as there are some scary imagery and some gore in both.