How many movies have Eiichi Kusumoto and Toshio Tanaka collaborated on?

They have worked on 4 movies together! Their first movie together was Lone Wolf and Cub: Baby Cart to Hades (1972) while their highest rated movie together was Lone Wolf and Cub: Baby Cart in Peril (1972). They have not worked together since Lone Wolf and Cub: White Heaven in Hell (1974). They are most known for their action films together.