Sister Street Fighter

Lee Long is a martial-arts champion who the police use as an undercover agent to infiltrate a drug ring responsible for importing heroin from Japan to Hong Kong. When he is identified and imprisoned, the police pressure his sister, Tina Long, to help them locate and free him. She gets the help of Lee's martial-arts school, including the powerful Sonny Kawasaka, for the inevitable battle-royale with the drug gang, which includes masters of many different 'schools' of fighting.

When the crime boss has to pick one of his thugs for a fight he takes his knife, throws it to the roof and kills a butterfly with it, then the knife falls to one guy's shoulder and that's the man he's chosen for the job. That's some serious inventiveness. And who's the guys he's gonna fight? That's Yasuaki Kurata of course.

Although not an official sequel (Shihomi plays a different character), the film is often referred to as a sequel to the series. Kiku Nakakawa, the only daughter of an old kimono shop owner in Kyoto, is enthusiastic about karate. In order to help her friend Michi avenge her brother, she sneaks into a movie studio in Kyoto where a drug dealing syndicate is based.

This time Koryu heads to Yokohama in search of a woman named Birei, kidnapped by diamond smugglers who move their hot rocks by surgically implanting them into the nubile buttocks of Chinese prostitutes. Koryu's older sister, working as a jewelry designer, is secretly if unhappily involved with the gangsters.