How many movies have Kouichirou Natsume and Masaharu Watanabe collaborated on?

They have worked on 6 movies together! Their first movie together was Naruto Shippuden the Movie: Bonds (2008) while their highest rated movie together was The Last: Naruto the Movie (2014). They have not worked together since The Last: Naruto the Movie (2014). They are most known for their animation films together.