How many movies have Kōsei Saitō and Meiko Kaji collaborated on?

They have worked on 4 movies together! Their first movie together was Night Butterflies (1971) while their highest rated movie together was Onihei Crime Files: Bungoro Amabiki (2009). They have not worked together since Onihei Crime Files: Sutegoro Takahagi (2010). They are most known for their crime films together.