How many movies have Kumi Ishii and Manabu Katayama collaborated on?

They have worked on 2 movies together! Their first movie together was Code Geass: Lelouch of the Re;Surrection (2019) and was their highest rated movie together. They have not worked together since Mobile Suit Gundam Hathaway (2021).

Mobile Suit Gundam Hathaway (2021)

Crew
Key Animation
Crew
Key Animation

Code Geass: Lelouch of the Re;Surrection (2019)

Crew
Animation Director
Crew
Key Animation
Crew
Key Animation