How many movies have Fumiaki Kouta and Hiroki Harada collaborated on?

They have worked on 4 movies together! Their first movie together was King of Thorn (2010) while their highest rated movie together was Doraemon: Nobita and the New Steel Troops: Winged Angels (2011). They have not worked together since Blood-C: The Last Dark (2012). They are most known for their animation films together.