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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 the future, all facets of society are tied into Oz, a virtual world inhabited by millions of users. Kenji, one of Oz’s moderators, was set to begin another typical summer when the lovely Natsuki asked him to accompany her to her hometown as a job.

Ciel Phantohive, head of the funtom company ever since his parents tragic death and the Queen of England's watchdog, signs a contract with a demon who he calls Sebastian Michaelis. They go through a series of events all in search of the killer of his parents while solving crimes that takes more skill than the Scotland Yard.