How many movies have Norifumi Suzuki and Takuzō Kawatani collaborated on?

They have worked on 21 movies together! Their first movie together was Blood of Revenge (1965) while their highest rated movie together was Terrifying Girls' High School: Delinquent Convulsion Group (1973). They have not worked together since Guys Who Never Learn (1987). They are most known for their action films together.