How many movies have Chiaki J. Konaka and Kazuya Konaka collaborated on?

They have worked on 8 movies together! Their first movie together was Report on Latent Narcotic Substances in the Brain: Drugless (1991) while their highest rated movie together was Lady Poison: Beasts of the Underground (1994). They have not worked together since Vamp (2019). They are most known for their horror films together.