How many movies have Koji Kobayashi and Takashi Iitsuka collaborated on?

They have worked on 2 movies together! Their first movie together was Tetsudon - Natural Born Fools For Foolish Adults (2018) while their highest rated movie together was Tetsudon: rated T for fools, idiots and dummies (2019). They have not worked together since Tetsudon: rated T for fools, idiots and dummies (2019).