 If you liked
Fullmetal Alchemist: Brotherhood
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 ...then you might like
Deadman Wonderland
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If you liked Deadman Wonderland or FMA:Brotherhood, you would like the other because they both have a young, male protagonist being pushed to limit physically, mentally and emotionally.
The two protagonist (Ed and Ganta) are haunted by deaths in their past. Both were helpless to stop their loved ones from dying, and went on a dangerous journey of action to overcome that past.