How many movies have Keiichi Ichikawa and Shuichi Ito collaborated on?

They have worked on 4 movies together! Their first movie together was Interstella 5555: The 5tory of the 5ecret 5tar 5ystem (2003) and was their highest rated movie together. They have not worked together since Clannad: The Motion Picture (2007). They are most known for their animation films together.