How many movies have Akira Ishihara and Tomisaburō Wakayama collaborated on?

They have worked on 4 movies together! Their first movie together was Red Peony Gambler: Gambler's Obligation (1968) while their highest rated movie together was Brothers Serving Time (1969). They have not worked together since The Silk Hat Boss 2 (1970). They are most known for their crime films together.