How many movies have Ayumi Miyakoshi and Kazuyuki Okitsu collaborated on?

They have worked on 3 movies together! Their first movie together was Arpeggio of Blue Steel -Ars Nova DC- (2015) while their highest rated movie together was Arpeggio of Blue Steel -Ars Nova Cadenza- (2015). They have not worked together since Twittering Birds Never Fly: The Clouds Gather (2020). They are most known for their animation films together.