 If you liked
Historie
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 ...then you might like
Shingeki no Kyojin: Before the Fall
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These manga' stories are very very different, but what makes them so similar is the protagonist. If you like a really good protagonist with lots of integrity and a very abnormally strong/quick-witted mindset who also goes on many adventures then look no further. Plus both the protagonist overcame slavery and went through a bunch of stuff. Plus plus both are underrated (IMO).