How many movies have Junichi Sato and Masayuki Onji collaborated on?

They have worked on 1 movie together! Their first movie together was Aria the Avvenire (2015) and was their highest rated movie together. They have not worked together since Aria the Avvenire (2015).

Aria the Avvenire (2015)

Crew
Director
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Character Designer
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Storyboard Artist
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Supervising Animation Director
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Animation Director