Violence Jack (1986)

Original title: バイオレンスジャック

After a devastating natural disaster, the Kanto region in Japan is now a wasteland of lawlessness, where the weak are playthings of the strong. Ruled with an iron fist by the Slum King, the people of Kanto have no hope left to them, living at the whims of raiders and bandits. In this hellish world, there is only one man with the power to stand up for the powerless, and his name alone strikes terror into evil hearts -- Violence Jack! Whether he’s saving women from sex camps, protecting the models of Zone C from those who covet their beauty, or exterminating a biker gang bent on destruction; if you oppress the weak, the only thing you can look forward to is a swift death from Jack’s knife!