How many movies have Hidenori Shibahara and Shinji Otsuka collaborated on?

They have worked on 4 movies together! Their first movie together was Tales from Earthsea (2006) while their highest rated movie together was The Tale of The Princess Kaguya (2013). They have not worked together since The Tale of The Princess Kaguya (2013). They are most known for their animation films together.