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In a post-apocalyptic Earth, the water has become toxic, except for some kept safe in a reservoir. A group of villagers have discovered safe water, and Sanga wants it. He and his band of killers go to kill everyone and steal it. As they do a mysterious man appears out of nowhere, killing some of Sanga's men. His name is Kenshiro, and he can beat any man with his martial art, Hokuto Shin Ken.
Source: Anime Network Online