How many movies have Kan Mukai and Shūji Kataoka collaborated on?

They have worked on 19 movies together! Their first movie together was Groper Hairdresser: Also Wears Underwear (1982) while their highest rated movie together was Groper Train: One Minute Before Departure (1985). They have not worked together since Groper Train: Mature Woman's Thighs (1992).