How many movies have Kow Otani and Makoto Kamiya collaborated on?

They have worked on 3 movies together! Their first movie together was Gamera 2: Attack of Legion (1996) and was their highest rated movie together. They have not worked together since Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack (2001). They are most known for their horror films together.