How many movies have Heihachiro Watanabe and Hideo Shirayama collaborated on?

They have worked on 4 movies together! Their first movie together was Horu in Rabu: Kusamura no Yokujô (1979) while their highest rated movie together was Woman with Wet Fingers (1984). They have not worked together since Marumo Jun no chijo densetsu (1984). They are most known for their drama films together.