What the fuck is going on. His friends get slaughtered, then he's in a prison where everyone's tryna kill everyone else, then he gets put in the insanity cell block. Bro this kids life is so fucked up. But i guess that's the beauty of this manga
Reading again this after the ending really explains a lot, and I noticed details I missed. They did a good job paving the story from beginning! Almsot everything makes sense when the conlusion is reached.