How many movies have Ichirou Ookouchi and Satoshi Shigeta collaborated on?

They have worked on 6 movies together! Their first movie together was Code Geass: Akito the Exiled 4: Memories of Hatred (2015) while their highest rated movie together was Kabaneri of the Iron Fortress Recap 2: Burning Life (2017). They have not worked together since Seven Days War (2019). They are most known for their animation films together.