How many movies have Erika Miyoshi and Risa Niigaki acted in together?

They have worked on 46 movies together! Their first movie together was Morning Musume. DVD Magazine Vol.2 (2004) while their highest rated movie together was Hello! Project DVD Magazine Vol.4 (2006). They have not worked together since Hello! Project 2013 COUNTDOWN PARTY 2013-2014 ~GOODBYE & HELLO!~ (2013).