How many movies have Mutsutoshi Ota and Riichirō Manabe collaborated on?

They have worked on 2 movies together! Their first movie together was Front Row Life (1968) while their highest rated movie together was Oh Seagull, Have You Seen the Sparkling Ocean? An Encounter (1975). They have not worked together since Oh Seagull, Have You Seen the Sparkling Ocean? An Encounter (1975).