How many movies have Ken Yamamoto and Yu Okano collaborated on?

They have worked on 2 movies together! Their first movie together was Promare (2019) while their highest rated movie together was Fate/Grand Order the Movie: Divine Realm of the Round Table: Camelot Wandering; Agateram (2020). They have not worked together since Fate/Grand Order the Movie: Divine Realm of the Round Table: Camelot Wandering; Agateram (2020).