How many movies have Hachirō Kai and Takashi Kodama collaborated on?

They have worked on 12 movies together! Their first movie together was Sukeban mafia: Chijoku (1980) while their highest rated movie together was Angel Guts: Red Porno (1981). They have not worked together since Ken-chan no oneesan (1983). They are most known for their drama films together.