How many movies have Hidehiko Okano and Tetsuya Nishio collaborated on?

They have worked on 2 movies together! Their first movie together was Naruto the Movie: Guardians of the Crescent Moon Kingdom (2006) 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).