How many movies have Keisuke Otori and Shingo Yamashiro acted in together?

They have worked on 4 movies together! Their first movie together was Wolves of the City, Operation "Rat" (1969) while their highest rated movie together was Red Peony Gambler: Oryu's Return (1970). They have not worked together since The Erotomaniac Daimyo (1972). They are most known for their drama films together.