How many movies have Chikao Ohtsuka and Kenji Utsumi acted in together?

They have worked on 7 movies together! Their first movie together was Ali Baba and the Forty Thieves (1971) while their highest rated movie together was Undersea Super Train: Marine Express (1979). 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.