How many movies have Akio Otsuka and Hirotaka Kato collaborated on?

They have worked on 2 movies together! Their first movie together was The River's Light (2009) and was their highest rated movie together. They have not worked together since The Empire of Corpses (2015).

The Empire of Corpses (2015)

Role
M (voice)
Crew
Supervising Animation Director
Crew
Key Animation

The River's Light (2009)

Role
格连
Crew
Key Animation