How many movies have Saori Hayami and Yuko Yahiro collaborated on?

They have worked on 2 movies together! Their first movie together was The Irregular at Magic High School: The Girl Who Summons the Stars (2017) while their highest rated movie together was Kaguya-sama: Love Is War -The First Kiss That Never Ends- (2022). They have not worked together since Kaguya-sama: Love Is War -The First Kiss That Never Ends- (2022).