How many movies have Akira Kamiya and Kazuya Saito collaborated on?

They have worked on 6 movies together! Their first movie together was Case Closed: The Fourteenth Target (1998) while their highest rated movie together was Gintama: The Movie: The Final Chapter: Be Forever Yorozuya (2013). They have not worked together since Gintama: The Movie: The Final Chapter: Be Forever Yorozuya (2013). They are most known for their animation films together.