How many movies have Anna Yamaguchi and Ikue Otani collaborated on?

They have worked on 3 movies together! Their first movie together was One Piece: Episode of Chopper Plus: Bloom in the Winter, Miracle Cherry Blossom (2008) while their highest rated movie together was One Piece Film: Strong World (2009). They have not worked together since The Last: Naruto the Movie (2014). They are most known for their animation films together.