How many movies have Shigenori Souya and Yoshikazu Yasuhiko collaborated on?

They have worked on 2 movies together! Their first movie together was Mobile Suit Gundam: The Origin II - Artesia's Sorrow (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 V: Clash at Loum (2017).