How many movies have Koichi Yamadera and Seiichi Shirato collaborated on?

They have worked on 3 movies together! Their first movie together was Lupin the Third: Jigen's Gravestone (2014) while their highest rated movie together was Lupin the Third: Goemon's Blood Spray (2017). They have not worked together since Lupin the Third: Goemon's Blood Spray (2017). They are most known for their animation films together.