How many movies have Ai Maeda and Aki Maeda acted in together?

They have worked on 4 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 Battle Royale II: Requiem (2003). They are most known for their action films together.