How many movies have Heihachiro Watanabe and Shosaku Kato collaborated on?

They have worked on 3 movies together! Their first movie together was Lady Caligula in Tokyo (1981) while their highest rated movie together was Female Gym Coach: Jump and Straddle (1981). They have not worked together since Beautiful Sisters: Seduced (1982). They are most known for their drama films together.