Hokuto no Ken Rei Gaiden: Karei naru Fukushuusha
Rei's Story - The Magnificent Avenger
北斗の拳レイ外伝—華麗なる復讐者—
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.