How many movies have Kōyū Ohara and Shinsho Nakamaru collaborated on?

They have worked on 5 movies together! Their first movie together was Runa's Confession: 'Men Crawling All Over Me' (1976) while their highest rated movie together was I Love It From Behind! (1981). They have not worked together since Pink Tush Girls: Slinking Classmates (1982). They are most known for their drama films together.