How many movies have Hitoshi Ishikawa and Ryuichi Hiroki collaborated on?

They have worked on 5 movies together! Their first movie together was Nishikawa Serina: Nozokibeya no onna (1984) while their highest rated movie together was I Am an S+M Writer (2000). They have not worked together since I Am an S+M Writer (2000). They are most known for their drama films together.