How many movies have Kouki Nagayoshi and Sagako Itakura collaborated on?

They have worked on 4 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 Fate/stay night: Heaven's Feel II. Lost Butterfly (2019). They are most known for their animation films together.