How many movies have Koichi Sonoi and Shigeru Ishihara collaborated on?

They have worked on 10 movies together! Their first movie together was This Is Noriko (1981) while their highest rated movie together was Sure Death 4 (1987). They have not worked together since Onihei Crime Files Special: Okatsu from Yamabukiya (2005). They are most known for their drama films together.