How many movies have Shin'ichirou Fukushima and Shuichi Ito collaborated on?

They have worked on 4 movies together! Their first movie together was Dr. Slump: Arale's Surprise Bang (1999) while their highest rated movie together was One Piece: Baron Omatsuri and the Secret Island (2005). They have not worked together since Yes! Precure 5: The Great Miracle Adventure in the Country of Mirrors (2007). They are most known for their comedy films together.