How many movies have Kenji Utsumi and Masami Hata collaborated on?

They have worked on 3 movies together! Their first movie together was Sea Prince and the Fire Child (1981) while their highest rated movie together was The Tale of Osamu Tezuka: I'm Son-Goku (1989). They have not worked together since Mouse Story: The Adventures of George and Gerald (2007). They are most known for their animation films together.