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Attack on Titan (literally translated as "Advancing Giants") is a Japanese manga series, and now an anime, originally written and illustrated by Hajime Isayama. The story centers around the lives of Eren Yeager, his adoptive sister Mikasa Ackerman, and their friend Armin Arlert, who live in a world where the remnants of the human population live inside cities surrounded by enormous walls due to the sudden appearance of the Titans, gigantic humanoid creatures who devour humans seemingly without reason. Their lives are changed forever after the appearance of a colossal Titan brings about the destruction of their home town and the death of Eren's mother, spurring them to enter the army to battle the Titans themselves.

The confrontation between the Earth Alliance (Naturals) and Zaft (Coordinators) originated in economic trouble had reached an impasse. War couldn't be stopped by that point, and thus this story begins one year later when Heliopolis, a resource satellite belonging to a neutral nation, is suddenly attacked by a Zaft mobile suit force. Their goal is to seize the Atlantic Alliance's newest Gundam mobile suits, which the Alliance has produced here amid total secrecy. The raid is successful, and Zaft captures four of the Gundams. Kira Yamato, a student at an industrial college, is drawn into the conflict when he is reunited with his old friend Aslan Zara. Tragically, Kira finds that his comrade Aslan and the other Coordinators are now his enemies. For patriotism's sake, Aslan sets out to defeat Kira. One against four... the battle of the Gundams begins!

Set on the fictional year of 2010, the world has been split into 3 superpowers: The Holy Britannian Empire (the Americas; also called Britannia), the Chinese Federation (Asia), and the European Union (Europe and Africa; previously known as the Euro-Universe. Also known as Europa United in Akito the Exiled).

It’s been one year since the failure of the Black Rebellion and the supposed death of Zero. Britannia has assigned Area 11 a “correctional education” status, where Elevens are made an example of by brute force, to try to prevent any future uprisings and suppress rebellious thoughts.

The story picks up after what happened in season one. Things that are left unexplained in the first season get explained in the new season in three separate arcs. Rika Furude lives in the small village of Hinamizawa with her friends. But behind this peace is a darkness that is well understood by Rika. She has been a witness to several unspeakable horrors.