How many movies have Kenichi Suemitsu and Yoshihide Sasaki collaborated on?

They have worked on 3 movies together! Their first movie together was Touken Ranbu: The Stage - Kyo-den: Moyuru Honnōji ~Saien~ (2017) and was their highest rated movie together. They have not worked together since Stage Play "Demon Slayer: Kimetsu no Yaiba" 2 - Kizuna (2021).