How many movies have Nobutaka Ike and Takafumi Nishima collaborated on?

They have worked on 4 movies together! Their first movie together was The Piano Forest (2007) while their highest rated movie together was The Garden of Sinners: Paradox Spiral (2008). They have not worked together since The Garden of Sinners: Paradox Spiral (2008). They are most known for their animation films together.