How many movies have Kenichi Ohki and Shuichi Okubo collaborated on?

They have worked on 3 movies together! Their first movie together was Case Closed: The Fourteenth Target (1998) and was their highest rated movie together. They have not worked together since Go! Anpanman: The Secret of Roll and Lola's Floating Castle (2002). They are most known for their animation films together.