How many movies have Masami Niwa and Shingo Adachi collaborated on?

They have worked on 2 movies together! Their first movie together was Sword Art Online: The Movie – Ordinal Scale (2017) 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 – Aria of a Starless Night (2021).