How many movies have Sonny Chiba and Yayoi Watanabe acted in together?

They have worked on 6 movies together! Their first movie together was Yakuza Wolf: I Perform Murder (1972) while their highest rated movie together was A Narcotics Agent's Ballad (1972). They have not worked together since The Okinawa War of Ten Years (1978). They are most known for their action films together.