How many movies have Gōzō Sōma and Kosaku Okano acted in together?

They have worked on 18 movies together! Their first movie together was Keishichō monogatari 108 gōsha (1959) while their highest rated movie together was Japan Organized Crime Boss (1969). They have not worked together since Japan's Violent Gangs: The Boss and the Killers (1969). They are most known for their crime films together.