How many movies have Shōji Sakai and Usagi Asō collaborated on?

They have worked on 12 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: Good Office Lady, Bad Office Lady, Normal Office Lady (1985).