Fist of the North Star: The Legend of Kenshiro

In the post-apocalyptic future, after his defeat at the hands of Shin, Kenshiro is captured by slavers and chooses to stay and protect the other slaves, despite being able to escape whenever he wants. He meets a family, including an old man with crippled legs, who are all brought together in a city ruled by the tyrannical Siska. With his newfound allies, Kenshiro battles against Guruma's son, Fugen, and eventually faces off against Jugai, another master of the Nanto School, leading to a fierce battle that ultimately results in the destruction of the city.