How many movies have Kiyoshi Kobayashi and Osamu Kobayashi acted in together?

They have worked on 4 movies together! Their first movie together was Galaxy Express 999: Can You Live Like a Warrior!! (1979) and was their highest rated movie together. They have not worked together since Crayon Shin-chan: Invoke a Storm! The Kasukabe Boys of the Evening Sun (2004). They are most known for their animation films together.