How many movies have Kuninori Yamazaki and Masahiro Yoshida collaborated on?

They have worked on 18 movies together! Their first movie together was Groper Train: One Shot in the Morning (1989) while their highest rated movie together was Apartment Wife: Keiko's Insane Sex Life (1990). They have not worked together since Shisshin OL: Fujin kakenshin 2 (1993).