How many movies have Emi Kitagawa and Katsuji Oyamada collaborated on?

They have worked on 4 movies together! Their first movie together was Shojo hanayome: Hajimete no yorokobi (2004) while their highest rated movie together was Saimin ecstasy: Nozokareta seiheiki (2007). They have not worked together since Saimin ecstasy: Nozokareta seiheiki (2007).