How many movies have Naozumi Yamamoto and Tetsuo Sao collaborated on?

They have worked on 6 movies together! Their first movie together was Foster Daddy, Tora! (1980) while their highest rated movie together was Tora-san's Love in Osaka (1981). They have not worked together since Tora-san's Song of Love (1983). They are most known for their comedy films together.