How many movies have Hiroshi Onogi and Tsubaki Nekoi collaborated on?

They have worked on 5 movies together! Their first movie together was Code Geass: Akito the Exiled 1: The Wyvern Arrives (2012) while their highest rated movie together was Code Geass: Akito the Exiled 3: The Brightness Falls (2015). They have not worked together since Code Geass: Akito the Exiled 5: To Beloved Ones (2016). They are most known for their animation films together.