How many movies have Rei Sakuma and Yoshio Takeuchi collaborated on?

They have worked on 5 movies together! Their first movie together was Fair, then Partly Piggy (1988) while their highest rated movie together was Oishinbo: Ultimate vs. Supremacy (1992). They have not worked together since Oishinbo: The Japan-America Rice War (1993). They are most known for their animation films together.