 If you liked
Gyo: Ugomeku Bukimi
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 ...then you might like
I Am a Hero
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gyo is also an apocalyptic manga, but instead of a virus killing man kind off and turning them into creatures that basically take over the world almost like zombies, its a machine that infects the corpses of all kinds of sea creatures like fish and sharks and basically anything that can fit into the machine virus thing. its worth a read if you have a boring afternoon.