How many movies have Akira Kurosawa and Ichirō Ryūzaki collaborated on?

They have worked on 5 movies together! Their first movie together was Currents of Youth (1942) while their highest rated movie together was Tora! Tora! Tora! (1970). They have not worked together since Tora! Tora! Tora! (1970). They are most known for their drama films together.