How many movies have Daiki Sugiyama and Keisuke Watanabe collaborated on?

They have worked on 4 movies together! Their first movie together was Naruto Shippuden the Movie: The Will of Fire (2009) while their highest rated movie together was Naruto Shippuden the Movie: Blood Prison (2011). They have not worked together since Love Live! Sunshine!! The School Idol Movie Over the Rainbow (2019). They are most known for their animation films together.