Sister Streetfighter: Hanging By A Thread (1974)
The second Sister Streetfighter film again features Etsuko Shiomi being sent to investigate a disappearance and a gang whose leader collects martial artists, and to pop in and see her sister whilst she's in the neighbourhood. The plot serves a video game-like purpose of getting her from fight to fight, whilst providing the director opportunities for trashy exploitation in the 1970's tradition.
Good trashy fun once more. No Sonny Chiba this time, but Yasuaki Kurata turns up to make sure Shiomi doesn't get lonely.