How many movies have Hiroki Yamaguchi and Tadaya Miyashita collaborated on?

They have worked on 4 movies together! Their first movie together was Hellevator: The Bottled Fools (2004) while their highest rated movie together was Bloody Chainsaw Girl Returns: Giko Awakens (2019). They have not worked together since Bloody Chainsaw Girl Returns: Revenge of Nero (2019). They are most known for their horror films together.