 If you liked
Gyo: Ugomeku Bukimi
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 ...then you might like
BioMeat: Nectar
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Gyo has a similar main premise: a story about weird creatures that attacks humanity and the survival of the main characters. This time the bad guy are fishes that has legs and started to swarm the city. They began to attack animals and human, and without spoiling the story, it is suffice to say that they continue to evolve in a pretty horrifying way. The pacing is pretty similar, although I think Gyo is a bit on the more gory side.