Proof of the Man (1977)

A young black man from Harlem, New York ( Joe Yamanaka ) receives large sum of money, buys himself new clothes and takes a flight to Tokyo. Shortly after arriving he is found fatally stabbed to death in a lift in a hotel at the same time a fashion show is held there by a designer Kyoko Yasugi ( Mariko Okada ). Detective Munesue ( Yusaku Matsuda ) starts to investigate this case which takes him to New York where he teams up with American detective Shuftan ( George kennedy ) to find out more about the dead man.