How many movies have Kazuhiko Inoue and Shinji Sugiyama collaborated on?

They have worked on 2 movies together! Their first movie together was Naruto the Movie: Ninja Clash in the Land of Snow (2004) while their highest rated movie together was Natsume's Book of Friends: The Waking Rock and the Strange Visitor (2021). They have not worked together since Natsume's Book of Friends: The Waking Rock and the Strange Visitor (2021).