How many movies have Chie Otsuki and Chika Sakamoto collaborated on?

They have worked on 2 movies together! Their first movie together was Digimon Adventure tri. Part 5: Coexistence (2017) while their highest rated movie together was Digimon Adventure: Last Evolution Kizuna (2020). They have not worked together since Digimon Adventure: Last Evolution Kizuna (2020).