How many movies have Mami Koyama and Tatsumi Yano collaborated on?

They have worked on 5 movies together! Their first movie together was Back to the Forest (1980) while their highest rated movie together was City Hunter Special: The Death of Vicious Criminal Saeba Ryo (1999). They have not worked together since City Hunter Special: The Death of Vicious Criminal Saeba Ryo (1999). They are most known for their animation films together.