How many movies have Yoko Hikasa and Yoshihisa Nakayama collaborated on?

They have worked on 4 movies together! Their first movie together was K-ON! Live Event ~Let's Go!~ (2010) while their highest rated movie together was K-On! The Movie (2011). They have not worked together since Beyond the Boundary: I'll Be Here – Future (2015). They are most known for their comedy films together.