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Among those who escaped from the ensuing massacre were three children: Eren Yeager, an aggressive boy Mikasa Ackerman, his quiet adoptive sister and Armin Arlert, Eren's bookish best friend.
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Those facts held true until the day a colossal Titan smashed a hole in the perimeter wall of the southern village of Shiganshina, which allowed its smaller kin to wander inside and wreak havoc.
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The two races have locked one another into a stalemate: the Titans cannot breach the walls, and humanity cannot venture outside the walls without risking heavy losses. For more than a hundred years, the last remnants of humanity have lived in a kingdom surrounded by walls designed to protect them from a powerful race of man-eating giants known as Titans.
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