How many movies have Rina Sato and Taku Iwasaki collaborated on?

They have worked on 3 movies together! Their first movie together was Binchō-tan (2006) 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). They are most known for their animation films together.