How many movies have Hiroaki Masuko and Masataka Kubota collaborated on?

They have worked on 4 movies together! Their first movie together was I Give My First Love to You (2009) while their highest rated movie together was Rurouni Kenshin Part III: The Legend Ends (2014). They have not worked together since Rurouni Kenshin Part III: The Legend Ends (2014). They are most known for their fantasy films together.