How many movies have Hiroki Touchi and Maaya Sakamoto acted in together?

They have worked on 6 movies together! Their first movie together was The Garden of Sinners: A Study in Murder (Part 1) (2007) while their highest rated movie together was Black Butler: Book of Murder (2014). They have not worked together since Black Butler: Book of the Atlantic (2017). They are most known for their animation films together.