How many movies have Hachirō Kai and Hideo Shirayama collaborated on?

They have worked on 3 movies together! Their first movie together was Beautiful Sisters: Seduced (1982) while their highest rated movie together was Nurse Diary: Beast Afternoon (1982). They have not worked together since Renzoku boko: Hakuchu no inmu (1982). They are most known for their drama films together.