How many movies have Ayumi Miyakoshi and Mai Nakahara collaborated on?

They have worked on 2 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 Arpeggio of Blue Steel -Ars Nova Cadenza- (2015).