How many movies have Masaki Onishi and Takahito Ôuchi collaborated on?

They have worked on 4 movies together! Their first movie together was Rurouni Kenshin Part I: Origins (2012) while their highest rated movie together was Rurouni Kenshin Part III: The Legend Ends (2014). They have not worked together since High & Low The Movie (2016). They are most known for their action films together.