A sprawling, apocalyptic and violent tale of battling demons. It involves the accidental release of a demonic species from Antarctica, whose numbers spread via an infection, which corrupts and transforms normal people. This leads to an apocalyptic war, in which humanity's only hope is Akira, a weedy teen who merges with a demonic entity to become Devilman. A powerful, yet conscientious beast that fights both monsters and the fascist and brutal human forces trying to wipe out the new species. Akira is opposed by his former best friend, the somewhat psychotic Ryo, who becomes an equally powerful demon, and a host of other creatures that pop in and out of the story before it all conveniently finishes up with a climatic showdown.