The enemy is a demon worship organization called Deadmans. They use the mysterious seal Vice to materialize the demons in the hearts of humans, creating monsters called Deadman. In order to protect his most important family from the clutches of Deadmans, the protagonist Igarashi Ikki signs a contract with the demon Vice who resides in his body. Ikki transforms into Kamen Rider Revi, and the demon Vice transforms into Kamen Rider Vice. The hero and the devil become partners! Unprecedented, the strongest partnership of one person and two bodies! "Kamen Rider Revice" is born!