How many movies have Akinori Nagaoka and Kenji Utsumi collaborated on?

They have worked on 6 movies together! Their first movie together was There Goes Our Hero (1979) while their highest rated movie together was Dr. Slump: Hoyoyo! Space Adventure (1982). They have not worked together since Touch 3 Don't Pass Me By (1987). They are most known for their animation films together.