How many movies have Hiroyuki Kawasaki and Shou Nishino collaborated on?

They have worked on 4 movies together! Their first movie together was Female Student (2005) while their highest rated movie together was Lady Ninja Kasumi 2: Love and Betrayal (2006). They have not worked together since Lady Ninja Kasumi 6: Yukimura Assasination (2008). They are most known for their action films together.