How many movies have Kazuo Mortuchi and Toshio Taniguchi collaborated on?

They have worked on 8 movies together! Their first movie together was A Certain Killer (1967) while their highest rated movie together was Lone Wolf and Cub: Sword of Vengeance (1972). They have not worked together since New Hoodlum Soldier Story: Firing Line (1972). They are most known for their action films together.