How many movies have Susumu Mitsunaka and Yasuzo Iino collaborated on?

They have worked on 4 movies together! Their first movie together was Sergeant Keroro The Super Duper Movie 2: Deep Sea Princess (2007) while their highest rated movie together was Sergeant Keroro The Super Duper Movie 3: Keroro vs. Keroro Great Sky Duel (2008). They have not worked together since Tiger & Bunny: The Rising (2014). They are most known for their animation films together.