How many movies have Masahiko Itoh and Ryuichi Hiroki collaborated on?

They have worked on 4 movies together! Their first movie together was Chikan to sukāto (1984) while their highest rated movie together was Nyan Nyan Musume (1984). They have not worked together since Tōsatsu mania: Furaidē no on'na (1986). They are most known for their drama films together.