Detective Hayata's friend is killed by criminals. In order to find the murder, Hayata infiltrate a gang, with the aim of getting closer to the big bosses responsible for the murder

Li Mansei is a martial-arts champion turned undercover agent. When he is captured by a drug lord, his sister Li Koryu turns to his former martial-arts school, including the powerful Sonny Kawasaka, for help in the inevitable battle royale.