How many movies have Tetsuhito Saito and Youichi Ishikawa collaborated on?

They have worked on 2 movies together! Their first movie together was You're Under Arrest: The Motion Picture (1999) while their highest rated movie together was Ranma ½ Nightmare! Incense of Spring Sleep (2008). They have not worked together since Ranma ½ Nightmare! Incense of Spring Sleep (2008).