How many movies have Hachirō Kai and Nobumasa Fukushima collaborated on?

They have worked on 17 movies together! Their first movie together was Climax! Okasareru hanayome (1980) while their highest rated movie together was Uno Koichiro no Hiraite Utsushite (1981). They have not worked together since Onsen Geisha: Yubune de Ippatsu (1982). They are most known for their drama films together.