How many movies have Kazuki Yao and Mitsuo Iwata acted in together?

They have worked on 5 movies together! Their first movie together was Megazone 23 III - Part 1 - The Awakening of Eve (1989) while their highest rated movie together was One Piece "3D2Y": Overcome Ace's Death! Luffy's Vow to his Friends (2014). They have not worked together since One Piece "3D2Y": Overcome Ace's Death! Luffy's Vow to his Friends (2014). They are most known for their animation films together.