How many movies have Manami Numakura and Seiji Kishi collaborated on?

They have worked on 4 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 Assassination Classroom the Movie: 365 Days' Time (2016). They are most known for their animation films together.