Black Tight Killers (1966)

Daisuke Honda, a war photographer in Vietnam, meets Yuriko Sawanouchi, a stewardess on his plane back to Japan. After drinking with her at a Tokyo bar, he becomes involved in saving Yuriko from assassination by stylish, female ninjas. When trying to rescue Yuriko from kidnappers, Daisuke discovers a group of foreigners are hunting for a WWII-era treasure hidden on an island by Yuriko's father.