Fist of the North Star

is a Japanese manga series written by Buronson and drawn by Tetsuo Hara that was serialized in Weekly Shōnen Jump from 1983 to 1988, spanning 245 chapters, which were initially collected in a 27-volume tankōbon edition by Shueisha. The English title "Fist of the North Star" was a fan attempt at translation from the C/FO Magazine published by the Cartoon/Fantasy Organization in the 1980s.

Plot
Near the end of the 20th century, a nuclear flame engulfed most of the Earth's surface, reducing most of the world into a vast desert wasteland. The survivors of mankind banded together in tribes in order to fight over the few supply of uncontaminated food and water still left in the world, with the strong often preying on the weak. Kenshiro, the successor of the assassination art known as Hokuto Shinken, wanders the wasteland after being separated from his fiancee Yuria (Julia) by a rival martial artist. Accompanied by two children, Bato (Bart) and Lin (Lynn), Ken becomes a savior to the weak and innocent from the various gangs threatening their survival. Throughout the course of his journey, Kenshiro encounters various formidable rivals and adversaries, ultimately culminating with Kenshiro's eldest adoptive brother Raoh, an oppressive tyrant who challenges Ken for the right of the Hokuto Shinken succession.

Several years afterward, Kenshiro reunites with the now grown Bato and Lin in order to stand up against a corrupt Imperial Army. The three, with the help of other rebels, manage to expose a conspiracy within the Imperial Army to keep the Heavenly Empress (Lin's estranged twin sister, Lui) imprisoned. The Empress is saved, only for Lin to be taken to the "Land of Asura", a country of warriors where only the mightiest survive. Kenshiro crosses to Asura in pursuit of her, only to find himself fighting against the three generals who rule over the land. Kenshiro finds himself fighting not only against his own blood brother Hyou, but also Kaioh, Raoh's own brother. After defeating Kaioh, Kenshiro goes on a few further adventures with Raoh's orphaned son, Ryu.

Official

 * Shin Kyuseishu Densetsu - Hokuto no Ken official website
 * Toei Animation

Other Sources

 * Wikipedia