How many movies have Saburō Isayama and Shirô Izome collaborated on?

They have worked on 4 movies together! Their first movie together was Kokoro no jitsugetsu: Retsujitsu hen - Gekko hen (1931) while their highest rated movie together was Five Scouts (1938). They have not worked together since Mud and Soldiers (1939). They are most known for their drama films together.