In 606 D.E. (Divine Era). Citizens of the Roman Empire are suffering from Emperor Phokas's oppressive policies and endless wars against neighboring countries. One day, "ASPAL," a slave boy living in Neapolis the empire's capital, meets a mysterious lady named “ZOÉ,” who lives only as a severed head. The encounter between Aspal and Zoé raises the curtain on a new story. New Code Geass series produced for its 20th anniversary.