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.
Eren Yeager and others of the 104th Training Corps have just begun to become full members of the Survey Corps. As they ready themselves to face the Titans once again, their preparations are interrupted by the invasion of Wall Rose—but all is not as it seems as more mysteries are unraveled. As the Survey Corps races to save the wall, they uncover more about the invading Titans and the dark secrets of their own members.