How many movies have Naomi Watanabe and Ruka Tanaka collaborated on?

They have worked on 2 movies together! Their first movie together was Pretty Guardian Sailor Moon Eternal the Movie Part 1 (2021) while their highest rated movie together was Pretty Guardian Sailor Moon Eternal the Movie Part 2 (2021). They have not worked together since Pretty Guardian Sailor Moon Eternal the Movie Part 2 (2021).