How many movies have Shingo Onitsuka and Yuki Kaji acted in together?

They have worked on 1 movie together! Their first movie together was K: Seven Stories Movie 4 - Lost Small World - To the Other Side of the Cage (2018) and was their highest rated movie together. They have not worked together since K: Seven Stories Movie 4 - Lost Small World - To the Other Side of the Cage (2018).