How many movies have Masahiko Otsuka and Toyonori Yamada collaborated on?

They have worked on 2 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 Gurren Lagann the Movie: The Lights in the Sky Are Stars (2009).