How many movies have Hiroyuki Horiuchi and Katsumi Ikeda collaborated on?

They have worked on 3 movies together! Their first movie together was Jin-Roh: The Wolf Brigade (1999) while their highest rated movie together was Professor Layton and the Eternal Diva (2009). They have not worked together since Professor Layton and the Eternal Diva (2009). They are most known for their animation films together.