How many movies have Kenzaburô Iida and Rena Tanaka collaborated on?

They have worked on 3 movies together! Their first movie together was Ekiden (2000) while their highest rated movie together was Yamazakura, The Cherry Tree in the Hills (2008). They have not worked together since Isoroku Yamamoto, the Commander-in-Chief of the Combined Fleet (2011). They are most known for their history films together.