How many movies have Hiroshi Saito and Ryo Saito collaborated on?

They have worked on 4 movies together! Their first movie together was The Seven Deadly Sins: Prisoners of the Sky (2018) while their highest rated movie together was Sword Art Online the Movie – Progressive – Aria of a Starless Night (2021). They have not worked together since Sword Art Online the Movie – Progressive – Scherzo of Deep Night (2022).