How many movies have Hidetsugu Ito and Tatsuo Yamada collaborated on?

They have worked on 4 movies together! Their first movie together was Spriggan (1998) while their highest rated movie together was Naruto Shippuden the Movie (2007). They have not worked together since Naruto Shippuden the Movie: The Will of Fire (2009). They are most known for their animation films together.