How many movies have Junji Inagawa and Koji Hayashida collaborated on?

They have worked on 4 movies together! Their first movie together was Junji Inagawa no Reidan: Hai Shittobukai Neko Soshite Shibo (2007) and was their highest rated movie together. They have not worked together since Junji Inagawa no Reidan: Kao Kitsune bon Soshite-ki (2007). They are most known for their horror films together.