How many movies have Atsushi Kasano and Tatsuaki Okamoto 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 Sword Art Online: The Movie – Ordinal Scale (2017). They have not worked together since Donten: Laughing Under the Clouds - Gaiden: Chapter 2 - The Tragedy of Fuuma Ninja Tribe (2018). They are most known for their adventure films together.