How many movies have Shiro Okamoto and Sonny Chiba acted in together?

They have worked on 3 movies together! Their first movie together was Invasion of the Neptune Men (1961) while their highest rated movie together was Man with a Funky Hat: The 20,000,000 Yen Arm (1961). They have not worked together since South Pacific Waves Are High (1962). They are most known for their action films together.