How many movies have Hachirō Kai and Tadayuki Ohira collaborated on?

They have worked on 3 movies together! Their first movie together was Uno Kôichirô no uwaki nikki (1980) while their highest rated movie together was Hard Scandal: Sex Drifter (1980). They have not worked together since Climax! Okasareru hanayome (1980). They are most known for their drama films together.