How many movies have Aoi Koga and Masaki Tachibana collaborated on?

They have worked on 4 movies together! Their first movie together was Princess Principal Crown Handler: Chapter 1 (2021) while their highest rated movie together was Princess Principal Crown Handler: Chapter 3 (2023). They have not worked together since プリンセス・プリンシパル Crown Handler 第3章「Cost for Custom Cars」 (2023). They are most known for their animation films together.