How many movies have Kohei Kumai and Rina Koike acted in together?

They have worked on 2 movies together! Their first movie together was Kamen Rider Backwards-Kiva: Queen of the Demonic Castle (2008) while their highest rated movie together was Kamen Rider Kiva: King of the Infernal Castle (2008). They have not worked together since Kamen Rider Kiva: King of the Infernal Castle (2008).