Following the demise of Britannia's notorious emperor, a year of peace reigns thanks to the United Federation of Nations. Yet, this tranquility shatters as militants abduct former princess Nunnally vi Britannia and Suzaku Kururugi, sparking a global crisis. Accusations point to the powerful Kingdom of Zilkhstan. In response, Kallen Stadtfeld and her team embark on a covert mission to investigate, encountering the enigmatic witch C.C. In the heart of Zilkhstan, they uncover a plot to resurrect the revolutionary figure who once reshaped history, aiming to bring salvation to a world teetering on the brink of chaos once more.