Violence Jack is a 12 ft seemingly unstoppable inhuman man, who after been uncovered from under some rubble, wanders the wastelands of a destroyed post-apocolyptic Kanto, which had been destroyed by the "Great Kanto Hellquake". Kanto is now ruled by a psychopathic, samurai warlord named the Slum King, who quickly becomes a rival to Jack and the two clash multiple times, with Jack ultimately emerging victorious in the two's final fight. Jack fights several other enemies throughout the series.