How many movies have Ai Takahashi and Takao Horiuchi acted in together?

They have worked on 4 movies together! Their first movie together was Uta Doki! Pop Classics Vol.8 (2008) while their highest rated movie together was Hello! Project 2020 Year-End Party ~GOODBYE & HELLO!~ (2020). They have not worked together since Hello! Project 2020 Year-End Party ~GOODBYE & HELLO!~ (2020).