How many movies have Houko Kuwashima and Yutaka Izubuchi collaborated on?

They have worked on 6 movies together! Their first movie together was RahXephon: Pluralitas Concentio (2003) while their highest rated movie together was Space Battleship Yamato 2199: A Voyage to Remember (2014). They have not worked together since Space Battleship Yamato 2199: Odyssey of the Celestial Ark (2014). They are most known for their animation films together.