How many movies have Keijirô Hara and Yûya Takayama collaborated on?

They have worked on 5 movies together! Their first movie together was Rape Zombie: Lust of the Dead (2012) while their highest rated movie together was Rape Zombie: Lust of the Dead 5 (2014). They have not worked together since Rape Zombie: Lust of the Dead 5 (2014). They are most known for their horror films together.