How many movies have Akira Toriyama and Mariko Mukai collaborated on?

They have worked on 2 movies together! Their first movie together was Dr. Slump: Hoyoyo! Space Adventure (1982) and was their highest rated movie together. They have not worked together since Dr. Slump and Arale-chan: Hoyoyo! The Treasure of Nanaba Castle (1984).