Bastard!! Heavy Metal, Dark Fantasy(1988)

BASTARD!!: Ankoku no Hakaishin

In a postapocalyptic world of heavy metal fantasy, the only thing able to save humans from orcs, lizard men, and other monsters is something even MORE evil. Sealed within a 14-year-old boy, the chaotic wizard Dark Schneider is unleashed to fight four mighty generals and their plot to resurrect the evil god Anslasax!

(Source: Viz Media)

Included one-shots:
Volume 1: Wizard!!: Bakuen no Seifukusha (pilot)
Volume 22: Binetsu Rouge
Volume 26: Virgin Tyrant