How many movies have Akio Otsuka and Satomi Arai acted in together?

They have worked on 5 movies together! Their first movie together was Mobile Suit Gundam: The Origin II - Artesia's Sorrow (2015) while their highest rated movie together was Mobile Suit Gundam: The Origin V: Clash at Loum (2017). They have not worked together since Code Geass: Lelouch of the Re;Surrection (2019). They are most known for their science fiction films together.