How many movies have Hiroyuki Kawasaki and Masato Takaoka collaborated on?

They have worked on 5 movies together! Their first movie together was Lady Ninja Kasumi 2: Love and Betrayal (2006) while their highest rated movie together was Lady Ninja Kasumi 6: Yukimura Assasination (2008). They have not worked together since Lady Ninja Kasumi 10 (2010). They are most known for their action films together.