How many movies have Etsuko Kozakura and Mariko Kawamoto collaborated on?

They have worked on 2 movies together! Their first movie together was Sergeant Keroro The Super Duper Movie 4: Crushing Invasion, Dragon Warriors (2009) while their highest rated movie together was Pokémon: Arceus and the Jewel of Life (2009). They have not worked together since Pokémon: Arceus and the Jewel of Life (2009).