How many movies have Keiko Yamamoto and Yoshiaki Kyougoku collaborated on?

They have worked on 4 movies together! Their first movie together was Eden of the East Movie I: The King of Eden (2009) while their highest rated movie together was Kuroko's Basketball the Movie: Last Game (2017). They have not worked together since Kuroko's Basketball the Movie: Last Game (2017). They are most known for their animation films together.