How many movies have Kazuki Nakashima and Nobuyuki Hiyama collaborated on?

They have worked on 4 movies together! Their first movie together was Gurren Lagann the Movie: Childhood's End (2008) while their highest rated movie together was Gurren Lagann the Movie: The Lights in the Sky Are Stars (2009). They have not worked together since Promare (2019). They are most known for their action films together.