How many movies have Kazuhiro Koyama and Toshiyuki Morikawa collaborated on?

They have worked on 4 movies together! Their first movie together was Naruto Shippuden the Movie: The Lost Tower (2010) while their highest rated movie together was Crayon Shin-chan: Shrouded in Mystery! The Flowers of Tenkazu Academy (2021). They have not worked together since Crayon Shinchan the Movie: The Tornado Legend of Ninja Mononoke (2022). They are most known for their animation films together.