Fist of The North Star Rei Gaiden

One day, a wanderer appears out of the wasteland to bring justice to the guilty and hope to the people—a warrior named Ken, a man who bears seven scars upon his chest and holds the secret of a mysterious martial art known as Hokuto Shinken, the Divine Fist of the North Star! (Source: VIZ Media)

A one shot that preceded the currently serializing Rei Gaiden series, which chronicles Rei's wanderings in the desert to find his sister Airi in the nuclear post-apocalyptic future of Hokuto No Ken.