In a world ravaged by toxic water, a ruthless leader named Sanga controls a fortified sanctuary known as The Lastland where safe water is hoarded. When a group of villagers discovers a hidden source of clean water, Sanga and his brutal followers set out to seize it by any means necessary. Amidst the chaos, a mysterious figure named Kenshiro appears, wielding the deadly martial art Hokuto Shin Ken that can best any opponent. As the battle for the precious water unfolds, Sanga's thirst for power clashes with Kenshiro's determination to protect the innocent, setting the stage for a fierce showdown in the unforgiving wasteland.