How many movies have Hideyuki Motohashi and Takehiro Koyama collaborated on?

They have worked on 4 movies together! Their first movie together was Zone of the Enders: Idolo (2001) while their highest rated movie together was Detective Conan: The Private Eyes' Requiem (2006). They have not worked together since Detective Conan: Private Eye in the Distant Sea (2013). They are most known for their animation films together.