How many movies have Kanta Kamei and Kouichi Arai collaborated on?

They have worked on 4 movies together! Their first movie together was Digimon Adventure 02: Hurricane Touchdown! The Golden Digimentals (2000) while their highest rated movie together was Ghost in the Shell 2: Innocence (2004). They have not worked together since Fullmetal Alchemist the Movie: Conqueror of Shamballa (2005). They are most known for their animation films together.