One day, Billy's girlfriend, Marian, is kidnapped off the street by the \\Black Warriors\\, a savage street gang led by a man named Willy. The Lee brothers set out on a rescue mission to crush the Black Warriors and save Marian. Set in a post-apocalyptic New York, twin brothers trained in the fighting style of Sou-Setsu-Ken. Together, they managed a small martial arts training school, teaching their students to self-defense. One day, Billy's girlfriend, Marian, is kidnapped off the street by the \\Black Warriors\\, a savage street gang led by a man named Willy. The Black Warriors demand to the Lee brothers to disclose their martial arts secrets in exchange for Marian's freedom. The Lee brothers set out on a rescue mission to crush the Black Warriors and save Marian.