How many movies have Kumiko Watanabe and Takehito Koyasu acted in together?

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 One Piece Film: Z (2012). They have not worked together since One Piece Film: Z (2012). They are most known for their animation films together.