How many movies have Izumi Hoki and Yuka Hirama collaborated on?

They have worked on 5 movies together! Their first movie together was Sakura Wars: The Movie (2001) while their highest rated movie together was Interstella 5555: The 5tory of the 5ecret 5tar 5ystem (2003). They have not worked together since City Hunter: Shinjuku Private Eyes (2019). They are most known for their animation films together.