How many movies have Mayumi Tanaka and Takao Koyama collaborated on?

They have worked on 11 movies together! Their first movie together was Mashin Eiyuuden Wataru: Soukaizan Eiyuu Densetsu (1990) and was their highest rated movie together. They have not worked together since Dragon Ball Z: Wrath of the Dragon (1995). They are most known for their science fiction films together.