How many movies have Eiji Nakada and Ichirou Ookouchi collaborated on?

They have worked on 4 movies together! Their first movie together was Code Geass: Lelouch of the Rebellion – Initiation (2017) while their highest rated movie together was Sing a Bit of Harmony (2021). They have not worked together since Sing a Bit of Harmony (2021). They are most known for their science fiction films together.