How many movies have Hiroshi Ôtake and Yoshiaki Koizumi collaborated on?

They have worked on 2 movies together! Their first movie together was Ninja Hattori-kun + Perman: ESP Wars (1984) and was their highest rated movie together. They have not worked together since Ninja Hattori-kun + Perman: Ninja Beast Jippō vs. Miracle Egg (1985).