Tero Kyofu is an arrogant young man who lost his parents in a tragic & traumatic accident. Out of despair, Tero wishes for his parents back. The Devil appears before Tero &, pretending to help him, offers him a job deal to hunt down souls who have escaped from the Underworld. Tero foolishly signs the deal & becomes Kamen Rider Deimos. He laters joins forces with another Kamen Rider, Kyoko Osore, a short-tempered fugitive who's attempting to get away with a terrible thing he commited.