The Empire of Britannia has invaded Japan using giant robot weapons called Knightmare Frames. Japan is now referred to as Area 11, and its people the 11's. A Britannian who was living in Japan at the time, Lelouch, vowed to his Japanese friend Suzaku that he'd destroy Britannia. Years later, Lelouch is in high school, but regularly skips out of school to go play chess and gamble on himself. One day, he stumbles on terrorists 11's who've stolen a military secret and is caught by a member of the Britannian task force sent after them, who is Suzaku. As the rest of the squad arrives, Suzaku is shot for disobeying orders, while the military secret, a young girl, gives Lelouch the power of Geass, which makes anyone obey any order. While Suzaku is secretly made the pilot of Britannia's brand new prototype Knightmare, Lancelot, Lelouch becomes the masked Zero to lead the rebellion to destroy Britannia once and for all.
Shimazu Toyohisa is the real-life samurai who fought in the pivotal Battle of Sekigahara. In his dying moments, Shimazu is transported to a world of magic with other famous warriors throughout history. These warriors are forced to fight each other in an endless battle.
In 1939, the imperialist nation of Germania launched a sudden invasion of its neighboring countries. This conflagration engulfed all of Europe in one fell swoop, and the era was dragged into the maelstrom of war. Then in 1940, Germania set its sights on Elystadt, a tiny principality blessed with breathtaking greenery and water in the Alps. Izetta is a descendant of a clan of witches who had passed down mysterious powers for generations. Since she was little, she and her grandmother lived their lives on the road, traveling between European countries in order to hide these powers. Fiine is the sole daughter in line to succeed Rudolph III, the ruler of the Principality of Elystadt. Since her father has been stricken by illness, she has been busy preparing for Germania's invasion in his stead.
Five girls live in 19th century London, a city within the Albion Kingdom divided into east and west by a large wall. The girls serve as undercover spies enrolled as students at the prestigious Queen's Mayfair school. The girls make use of their individual abilities to remain active in the underground world of disguise, espionage, infiltration, and car chases.