How many movies have Etsuko Kozakura and Jouji Nakata acted in together?

They have worked on 4 movies together! Their first movie together was Sergeant Keroro The Super Duper Movie 2: Deep Sea Princess (2007) while their highest rated movie together was Sergeant Keroro The Super Duper Movie 3: Keroro vs. Keroro Great Sky Duel (2008). They have not worked together since Sergeant Keroro The Super Duper Movie 5: Creation! Ultimate Keroro, Wonder Space-Time Island (2010). They are most known for their animation films together.