How many movies have Nobuhiro Watsuki and Takero Hisamatsu collaborated on?

They have worked on 2 movies together! Their first movie together was Rurouni Kenshin Part I: Origins (2012) while their highest rated movie together was Rurouni Kenshin Part II: Kyoto Inferno (2014). They have not worked together since Rurouni Kenshin Part II: Kyoto Inferno (2014).