How many movies have Hiromi Niioka and Tetsuro Aoki collaborated on?

They have worked on 3 movies together! Their first movie together was Saint Seiya: Legend of Crimson Youth (1988) while their highest rated movie together was Yo-kai Watch Shadowside: Resurrection of the Demon King (2017). They have not worked together since Yo-kai Watch Shadowside: Resurrection of the Demon King (2017). They are most known for their animation films together.