Sister Street Fighter

Onna hissatsu ken is a movie starring Etsuko Shihomi, Shin'ichi Chiba, and Asao Uchida. A young martial artist is on a mission to rescue her brother who's being held captive by a sadistic drug lord.
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.