How many movies have Hisashi Katsuta and Osamu Tezuka collaborated on?

They have worked on 4 movies together! Their first movie together was Jungle Emperor (1966) while their highest rated movie together was The Tale of Osamu Tezuka: I'm Son-Goku (1989). They have not worked together since The Tale of Osamu Tezuka: I'm Son-Goku (1989). They are most known for their animation films together.