How many movies have Daisuke Namikawa and Kazuhiko Kato collaborated on?

They have worked on 8 movies together! Their first movie together was Lupin the Third: Blood Seal of the Eternal Mermaid (2011) while their highest rated movie together was Lupin the Third: Goemon's Blood Spray (2017). They have not worked together since Lupin III: The First (2019). They are most known for their animation films together.