How many movies have Koichi Sato and Ryō Ono acted in together?

They have worked on 2 movies together! Their first movie together was Fukushima 50 (2020) while their highest rated movie together was Baian the Assassin, M.D.: Part 2 (2023). They have not worked together since Baian the Assassin, M.D.: Part 2 (2023).