Nobuo Kawai

After failing to reach a deal with her enemies, a mercenary karateka protects the daughter of a recently-deceased oil tycoon from the evil conglomerate gunning for her inheritance.

After World War II when Okinawa was under control of the US, the local Yakuza prospered. But when the island was returned to Japan, the mainland Yakuza tries to take over and the locals tries to compete.