How many movies have Hiroyuki Kawasaki and Tatsuo Wakabayashi collaborated on?

They have worked on 2 movies together! Their first movie together was 隠密くノ一忍法帳 餓鬼姉妹 (2005) and was their highest rated movie together. They have not worked together since Lady Ninja Kasumi 4: Birth of a Ninja (2007).