26-year-old Shogo Washio sense danger from the expansion of Asian superpower nation Ouran. Shogo Washio teams up with Kenzo Nakagishi and establishes a new political party. He loses in the elections to gain a seat in the house of representatives. A few years later Japan is now invaded by the country of Ouran and falls under the military occupation of that country. Basic freedoms like speech and religion are lost, while protestors are killed. In this environment, Shogo Washio joins the underground resistance organization ROLE.

The “Amazon Livestock Project,” a mysterious care facility, the Amazon extermination organization 4C (Competitive Creatures Control Center) pursuing Haruka Misuzawa . . . all come together in a tale of symbiosis and competition; the mortal combat between the carnivore and herbivore. And, finally, an end to the troubles and conflicts of the Riders, two beings confronting a fierce fate.

Reincarnation is the second of two theatrical compilation movies that preceded the release of "Kamen Rider Amazons: The Last Judgement" feature film. Reincarnation compiles the events of Season 2, it's been five years since the conclusion of season 1, the existence of the Amazons has become public knowledge, putting Nozama Pharmaceutical out of business. In their place is 4C (Competitive Creatures Control Center), a new government organisation tasked with hunting down and containing the Amazons threat. However, the Amazon Cells have mutated into a strain capable of infecting humans, transforming victims into insane and bloodthirsty monsters.