How many movies have Hollow Dragon and Tomoyuki Iwasaki collaborated on?

They have worked on 8 movies together! Their first movie together was Sekuhara shûshoku mensetsu: Joshidai nama naburi (1997) while their highest rated movie together was Gibo no onanii: Hatsujô roshutsu (1997). They have not worked together since Beast Shadow: Scars of Assault (2001).