How many movies have Mei Isai and Shigeru Saito collaborated on?

They have worked on 5 movies together! Their first movie together was Sound! Euphonium the Movie – Our Promise: A Brand New Day (2019) while their highest rated movie together was Violet Evergarden: The Movie (2020). They have not worked together since Free! the Final Stroke the Second Volume (2022). They are most known for their drama films together.