How many movies have Akira Kuji and Nenji Kobayashi acted in together?

They have worked on 13 movies together! Their first movie together was The Hoodlum Brothers (1965) while their highest rated movie together was Brutal Tales of Chivalry 5: Man With The Karajishi Tattoo (1969). They have not worked together since Female Prisoner Scorpion: Jailhouse 41 (1972). They are most known for their crime films together.