How many movies have Hisashi Saito and Koji Watanabe collaborated on?

They have worked on 3 movies together! Their first movie together was Digimon Adventure 02: Hurricane Touchdown! The Golden Digimentals (2000) while their highest rated movie together was Sword Art Online the Movie – Progressive – Aria of a Starless Night (2021). They have not worked together since Sword Art Online the Movie – Progressive – Aria of a Starless Night (2021). They are most known for their science fiction films together.