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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.

In a world where having superpowers is the norm, heroes fight day and night against the villains who terrorize the populace in order to keep peace and order in the society. The story follows a seemingly bland but extremely powerful individual named Saitama, who initially fights as a hero for fun.

The "Seven Deadly Sins," a group of evil knights who conspired to overthrow the kingdom of Britannia, were said to have been eradicated by the Holy Knights, although some claim that they still live. Ten years later, the Holy Knights have staged a Coup d'état and assassinated the king, becoming the new, tyrannical rulers of the kingdom.

After the unsustainable growth of the human population on Earth, the United Nations has opted to colonize Mars. During this expedition, the humans discovered two alien technologies: The Bacillus virus and the Crusnik nanomachines.