How many movies have Katsuji Oyamada and Seiji Nakamitsu collaborated on?

They have worked on 38 movies together! Their first movie together was Groper Train: Open It With Your Fingers! (1993) while their highest rated movie together was Twin Blades of the Ninja (2007). They have not worked together since Onna sagi-shi to bijin singer: O-atsui no wa dotchi? (2015).