How many movies have Ryō Kaihara and Takehiko Tamiya collaborated on?

They have worked on 11 movies together! Their first movie together was New Hotaru The Hyper Swindler 4 (2006) while their highest rated movie together was 17, Unstoppable (2023). They have not worked together since 17, Unstoppable (2023). They are most known for their drama films together.