How many movies have Ikuo Nishikawa and Yasuhiro Ohtsuka collaborated on?

They have worked on 2 movies together! Their first movie together was Appleseed (2004) while their highest rated movie together was Naruto the Movie: Ninja Clash in the Land of Snow (2004). They have not worked together since Naruto the Movie: Ninja Clash in the Land of Snow (2004).