How many movies have Motoyoshi Iwasaki and Soichiro Hoshi collaborated on?

They have worked on 2 movies together! Their first movie together was Heaven's Lost Property the Movie: The Angeloid of Clockwork (2011) while their highest rated movie together was Heaven's Lost Property Final – The Movie: Eternally My Master (2014). They have not worked together since Heaven's Lost Property Final – The Movie: Eternally My Master (2014).