How many movies have Katsuji Oyamada and ＭＡＳＡ collaborated on?

They have worked on 1 movie together! Their first movie together was Akogare no eigo no sensei: Kankin baibu chôkyô (1997) and was their highest rated movie together. They have not worked together since Akogare no eigo no sensei: Kankin baibu chôkyô (1997).