How many movies have Yoshikazu Katō and Yusuke Sakamoto collaborated on?

They have worked on 2 movies together! Their first movie together was Aniki to ore III: Suki to ienakute (2006) while their highest rated movie together was Shin aniki to ore: Atsuki otoko michi (2008). They have not worked together since Shin aniki to ore: Atsuki otoko michi (2008).