This card is postmarked in 2014 from China.
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Attack on Titan is a Japanese manga series written and illustrated by Hajime Isayama. The series began in 2009.
It is set in a world where humanity lives inside cities surrounded by enormous walls as a defense against the Titans, gigantic humanoid creatures who devour humans seemingly without reason. The story initially centers on Eren Yeager, his adoptive sister Mikasa Ackerman, and their childhood friend Armin Arlert, who join the military to fight the Titans after their home town is invaded.