How many movies have Kazuko Sugiyama and Mariko Mukai acted in together?

They have worked on 3 movies together! Their first movie together was Dr. Slump: Hoyoyo! Space Adventure (1982) while their highest rated movie together was Dr. Slump and Arale-chan: Hoyoyo! The Great Race Around The World (1983). They have not worked together since Dr. Slump and Arale-chan: Hoyoyo! The Treasure of Nanaba Castle (1984). They are most known for their animation films together.