How many movies have Kaoru Sono and Shunya Ito collaborated on?

They have worked on 2 movies together! Their first movie together was Female Prisoner Scorpion: #701 (1972) while their highest rated movie together was Female Prisoner Scorpion: Jailhouse 41 (1972). They have not worked together since Female Prisoner Scorpion: Jailhouse 41 (1972).