Gyo, Vol. 2 by Junji Ito

As the plague of reeking, mechanized sea creatures overruns Tokyo, a young man searches for his missing girlfriend while a deranged scientist reveals the wartime origins of bio-mechanical walkers powered by corpse gas. The contagion spreads to humans, twisting bodies into gas-swollen marionettes, and a predatory circus exploits the chaos, parading the afflicted as grotesque attractions. A failed rescue and the advancing stench spiral into a bleak, apocalyptic collapse with little hope amid the rot.

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