How many movies have Shiro Hamaguchi and Yoshihiro Sekiya collaborated on?

They have worked on 4 movies together! Their first movie together was Girls und Panzer der Film (2015) while their highest rated movie together was Girls und Panzer das Finale: Part III (2021). They have not worked together since Girls und Panzer das Finale: Part III (2021). They are most known for their action films together.