How many movies have Atsuko Otani and Ayumu Kotake collaborated on?

They have worked on 4 movies together! Their first movie together was Naruto the Movie: Guardians of the Crescent Moon Kingdom (2006) while their highest rated movie together was Naruto Shippuden the Movie: Bonds (2008). They have not worked together since Naruto Shippuden the Movie: Blood Prison (2011). They are most known for their animation films together.