Britannia has fallen together with Lelouch's death. His brother Schneizel manages to unite the fragmented nations to restore order and peace as The United Federation of Nations. However, a faction of Britannian forces declare war on the United States of Japan, conquering Hokkaido...

It's been 1 year since the death of Lelouch. Countries around the world had formed the Great United Nations but the peace "Zero Requiem" brought was short-lived and were now challenged by the Kingdom of Zilkhistan, who were displeased the peace was preventing them from profiting...