How many movies have Hirofumi Nakata and Tsutomu Awata collaborated on?

They have worked on 3 movies together! Their first movie together was Spriggan (1998) while their highest rated movie together was Sinbad - The Flying Princess and the Secret Island (2015). They have not worked together since Sinbad - The Flying Princess and the Secret Island (2015). They are most known for their animation films together.