How many movies have Katsutoshi Akiyama and Masataka Iwao acted in together?

They have worked on 12 movies together! Their first movie together was Battles Without Honor and Humanity: Deadly Fight in Hiroshima (1973) while their highest rated movie together was Japan's Don (1977). They have not worked together since Samurai Reincarnation (1981). They are most known for their crime films together.