How many movies have Riki Kitazawa and Takeshi Katsurayama collaborated on?

They have worked on 4 movies together! Their first movie together was Mobile Suit Gundam: The Origin I - Blue-Eyed Casval (2015) while their highest rated movie together was Mobile Suit Gundam: The Origin V: Clash at Loum (2017). They have not worked together since Mobile Suit Gundam: The Origin VI – Rise of the Red Comet (2018). They are most known for their animation films together.