Violence Jack: Jigoku Gai-hen
English name: Violence Jack: Evil Town
Genres: Action, Drama, Horror
Type: OVA, Episodes: 1
Aired: Dec 6, 1988
Studio: Studio 88
Source: Manga
Rating: Rx - Hentai
Synopsis:
The World as we know it has been torn apart shattered by a series of natural disasters that have turned civilization into a brutish nightmare of survival and has left whole cities buried beneath the Earth. It's now a lethal and chaotic place, a place where only the strongest and most savage remain alive. The strongest of them all is a giant warrior known as Violence Jack… 

Violence Jack tries to avert a civil war brewing among the wretched inhabitants of a subterranean metropolis called Evil Town. Based on a character created by manga horror specialist, Go Nagai. 

(Source: AniDB)