How many movies have Futoshi Nishimura and Hideki Onuki collaborated on?

They have worked on 5 movies together! Their first movie together was Kazuo Umezu's Horror Theater: Diet (2005) while their highest rated movie together was Kazuo Umezu's Horror Theater: Snake Girl (2005). They have not worked together since Kazuo Umezu's Horror Theater: Snake Girl (2005). They are most known for their horror films together.