This isn't a Sonny Chiba film, although it has the same name as the series, and he does appear briefly in the film, it features the very capable Etsuko Shihomi, one of his students.
This is her first leading role and she would make many films before achieving award status, but she is still very watchable and entertaining in this non-stop karate exhibition.
Be it Asian beanpoles armed with Nunchukas or elderly men wielding metallic claws, our lovely heroine will crush anyone who tries to prevent her from rescuing her brother from the clutches of the vile villains that hold him.
You must really like karate to watch this film as that is all there is. Be warned that there is not a lot of gore, but there is one rape scene.