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 Kaede (2007). They have not worked together since Lady Ninja Kasumi 10 (2010). They are most known for their action films together.