How many movies have Eiji Wakamatsu and Liang Shuang collaborated on?

They have worked on 1 movie together! Their first movie together was Is It Wrong to Try to Pick Up Girls in a Dungeon?: Arrow of the Orion (2019) and was their highest rated movie together. They have not worked together since Is It Wrong to Try to Pick Up Girls in a Dungeon?: Arrow of the Orion (2019).