How many movies have Tetsuya Nishio and Yasuyuki Kai collaborated on?

They have worked on 5 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 The Deer King (2021). They are most known for their animation films together.