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This post-apocalyptic OVA is about the strongest warrior left on the now raw and desperate Earth after a series of natural disasters destroy cities, lives, and all legal order. Jack tries to use his power to avoid the war brewing between surviving factions, but the world might be too far gone for even a man like Jack to maintain peace. This series is actually related to the Devilman franchise, and while not mentioned explicitly in the series, the natural disasters that ravage the world are meant to have been a result of the final battle between Satan and Devilman.