In 1971, a military organization called NOAH led an expedition in Latin America and discovered the remains of the first devil Giff and an artifact from which they developed Vistamps. In the present, Giff's remains are in the possession of a NOAH splinter faction called Deadmans, a devil-worshiping cult who seeks to resurrect him by using Proto Vistamps to convert peoples' inner demons to their fold. Opposing Deadmans is an organization called Fenix, which has developed the Revice Driver for someone who has tamed their inner demon. Ikki Igarashi, who runs a sentō with his family, ends up acquiring the belt while forming a pact with his inner demon, Vice, to fight Deadmans together as Kamen Riders Revi and Vice.
