How many movies have Ryoko Shiraishi and Sanae Kobayashi acted in together?

They have worked on 6 movies together! Their first movie together was Towa no Quon 1: The Ephemeral Petals (2011) while their highest rated movie together was Fafner: Behind the Line (2023). They have not worked together since Fafner: Behind the Line (2023). They are most known for their animation films together.