How many movies have Shu Watanabe and Toshiya Niidome collaborated on?

They have worked on 4 movies together! Their first movie together was Eden of the East Movie II: Paradise Lost (2010) while their highest rated movie together was Road to Ninja: Naruto the Movie (2012). They have not worked together since Road to Ninja: Naruto the Movie (2012). They are most known for their animation films together.