How many movies have Hideki Oka and Tsuyoshi Kazuno collaborated on?

They have worked on 3 movies together! Their first movie together was Ballads (1993) while their highest rated movie together was Ultra Galaxy Legend Side Story: Ultraman Zero vs. Darklops Zero - Stage I: Cosmic Collision (2010). They have not worked together since Ultra Galaxy Legend Side Story: Ultraman Zero vs. Darklops Zero - Stage II: Zero's Suicide Zone (2010). They are most known for their science fiction films together.