How many movies have Kaori Shimizu and Kazuhiko Seki collaborated on?

They have worked on 3 movies together! Their first movie together was Magical Girl Lyrical Nanoha: The Movie 2nd A's (2012) while their highest rated movie together was Magical Girl Lyrical Nanoha: Detonation (2018). They have not worked together since Magical Girl Lyrical Nanoha: Detonation (2018). They are most known for their animation films together.