How many movies have Takao Nakano and Taro Kiba collaborated on?

They have worked on 2 movies together! Their first movie together was Ultraman X The Movie: Here He Comes! Our Ultraman (2016) while their highest rated movie together was Ultraman R/B The Movie: Select! The Crystal of Bond (2019). They have not worked together since Ultraman R/B The Movie: Select! The Crystal of Bond (2019).