How many movies have Tsutomu Nishiyama and Yasuzo Iino collaborated on?

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