How many movies have Rina Nagisa and Tadashi Watanabe collaborated on?

They have worked on 6 movies together! Their first movie together was Semi-Document: Sukeban Bodyguard (1974) while their highest rated movie together was Joshi daigaku maruhi report: Nikutai nyûgaku-shiki (1977). They have not worked together since Semi-document: Joken: Gushonure (1978).