 If you liked
Btooom!
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 ...then you might like
Kiseijuu: Sei no Kakuritsu
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They are both done by studio Madhouse. They share many of the same genres: Psychological, Sci-Fi, Action and Seinen. They have a very similar art style too in my opinion. Also, they both have some brutal death scenes and are overall fairly violent. The main characters in each anime did not want to be put in the situation they are in. Finally, EVERYONE WANTS TO KILL THE MAIN CHARACTER!
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Recommended by 64BitRatchet