How many movies have Ikuo Sekimoto and Takuzō Kawatani collaborated on?

They have worked on 8 movies together! Their first movie together was Red Peony Gambler: Execution of Duty (1972) while their highest rated movie together was Terrifying Girls' High School: Delinquent Convulsion Group (1973). They have not worked together since Momotarō Zamurai III (1994). They are most known for their drama films together.