How many movies have Seiji Kishi and Suzuko Mimori 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 Yuuki Yuuna is a Hero: Washio Sumi's Chapter 2 - Spirit (2017). They have not worked together since Yuuki Yuuna is a Hero: Washio Sumi's Chapter 2 - Spirit (2017). They are most known for their animation films together.