Zombiepowder.

Gamma Akutabi is a mysterious figure, drifting through the western desert with a giant sword slung over his shoulder and a right arm made completely of metal spreading up and over his cheek. He searches endlessly for a mythical set of 12 Rings of the Dead—jewelry said to give life to the possessor. These rings are hunted by mercenaries and outlaws alike for a wide variety of reasons, but Gamma seeks to grant himself eternal life by possessing all 12. Gamma comes across teenager John Elwood Shep...

Zombie Powder. was published in English by VIZ Media under the Shonen Jump imprint from September 5, 2006 to June 5, 2007.