How many movies have Kin'ya Aikawa and Koichi Igawa acted in together?

They have worked on 4 movies together! Their first movie together was Murder on Raicho 9 (1987) and was their highest rated movie together. They have not worked together since Kyotaro Nishimura's Travel Mystery - Soya Honsen Murder Incident (2001). They are most known for their mystery films together.