How many movies have Sagako Itakura and Yoshikatsu Matsumoto collaborated on?

They have worked on 6 movies together! Their first movie together was The Disappearance of Haruhi Suzumiya (2010) while their highest rated movie together was K-On! The Movie (2011). They have not worked together since Sound! Euphonium the Movie – Welcome to the Kitauji High School Concert Band (2016). They are most known for their animation films together.