How many movies have Ai Maeda and Makoto Kamiya collaborated on?

They have worked on 3 movies together! Their first movie together was Gamera 3: Revenge of Iris (1999) while their highest rated movie together was Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack (2001). They have not worked together since Japan Sinks (2006). They are most known for their horror films together.