How many movies have Kazuko Sugiyama and Nobuo Koyama collaborated on?

They have worked on 3 movies together! Their first movie together was 21 Emon Welcome to the Space (1981) while their highest rated movie together was Urusei Yatsura: Beautiful Dreamer (1984). They have not worked together since Urusei Yatsura: Beautiful Dreamer (1984). They are most known for their science fiction films together.