Eden: It's an Endless World!(1997)

In the near future, a large portion of humanity is wiped out by a brutal, new virus that hardens the skin while dissolving internal organs. Those who aren't immune are either severely crippled or allowed to live with cybernetically enhanced bodies. Taking advantage of a world in chaos, a paramilitary force known as the Propater topples the United Nations and seeks world domination. Elijah, a young survivor searching for his mother, travels towards the Andes Mountains with an artificially intelligent combat robot. When he encounters a group of anti-Propater freedom fighters, a maelstrom of unique characters unfolds. Graphic, cyberpunk, and philosophical, Eden is a place where endearing heroes face a constant struggle for survival and violent surprises wait around every corner!

(Source: Dark Horse)

Note: Includes five extra chapters.