18+ Violence Jack

A shocking and violent look at a post apocalyptic future. Many different stories centre around an array of characters dealing with life in this desolate world. All the stories feature a huge man named Jack who is in an ongoing battle with a villain named Slum King.

(Source: ANN)

Note: This is kanzenban version which consists of: 7 volumes (published by Kodansha) and 31 volumes (published by Nihon Bungeisha) merged into 18 volumes.