 If you liked
Mahou Shoujo Madoka★Magica
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 ...then you might like
Shingeki no Kyojin
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-Both are very dark, violent, and tragic anime that involves guts, killing and determination.
-The difference is that Madoka is more on magical girls, while SnK is an action fantasy series focused on apocalyptic situations such as slaying Titans.
-Both are very overrated and popular anime that are highly recommended to those who are watching anime for the first time.