Fist of the North Star, Volume 4 (Fist of the North Star #41-54)

Ken, the wielder of the legendary Hokuto Shinken martial arts style, once trained with three other students of the technique. One of them, Jagi, could never accept their master's choice of Ken as the successor. Now Jagi has become a murderous wasteland warlord, terrorizing the innocent... in Ken's name! Ken must face off with Jagi to clear his reputation and restore the honor of Hokuto Shinken. But Jagi is not the only one of Ken's former brothers who may be using Hokuto Shinken for evil deeds...