How many movies have Risa Niigaki and Sayaka Ichii acted in together?

They have worked on 6 movies together! Their first movie together was Morning Musume. ALL SINGLES COMPLETE ~10th ANNIVERSARY~ (2007) while their highest rated movie together was Hello! Project 2019 Winter ~YOU & I~ Hello! Project 20th Anniversary!! (2019). They have not worked together since Petit Best 20 2020 (2020).