How many movies have Ichirō Ōtsu and Shinichirō Mikami collaborated on?

They have worked on 3 movies together! Their first movie together was The Yakuza Code Still Lives (1976) while their highest rated movie together was 1750 Days of Turbulence (1990). They have not worked together since Yakuza Warfare (1991). They are most known for their crime films together.