How many movies have Aika Mitsui and Mika Muto acted in together?

They have worked on 6 movies together! Their first movie together was Hello! Project 2007 Winter ~Wonderful Hearts Otome Gocoro~ (2007) while their highest rated movie together was Hello! Project 2007 Winter ~Shuuketsu! 10th Anniversary~ (2007). They have not worked together since Hello! Project 2008 Winter ~Kettei! Hello☆Pro Award '08~ (2008).