How many movies have Kazumasa Otani and Mitsuru Oki collaborated on?

They have worked on 4 movies together! Their first movie together was Tensou Sentai Goseiger vs Shinkenger: Epic on the Silver Screen (2011) while their highest rated movie together was Engine Sentai Go-Onger: 10 Years Grand Prix (2018). They have not worked together since Engine Sentai Go-Onger: 10 Years Grand Prix (2018). They are most known for their adventure films together.