How many movies have Kei Ikeda and Naoko Watanabe collaborated on?

They have worked on 1 movie together! Their first movie together was 眩しくて見えなかったから長い瞬きを繰り返した (2013) and was their highest rated movie together. They have not worked together since 眩しくて見えなかったから長い瞬きを繰り返した (2013).