How many movies have Chisato Okai and Saki Mori acted in together?

They have worked on 20 movies together! Their first movie together was Petit Best 7 (2006) while their highest rated movie together was Hello! Project 2014 COUNTDOWN PARTY 2014-2015 ~GOODBYE & HELLO!~ (2014). They have not worked together since Hello! Project 2015 Hina Fes ~Mankai! The Girls' Festival~ ANGERME & Juice=Juice Premium (2015).