How many movies have Kaede Ose and Kanna Arihara acted in together?

They have worked on 4 movies together! Their first movie together was Petit Best 7 (2006) while their highest rated movie together was Hello! Project 2007 Winter ~Shuuketsu! 10th Anniversary~ (2007). They have not worked together since Hello! Project 2007 Summer 10th Anniversary Dai Kanshasai ~Hello☆Pro Natsu Matsuri~ (2007).