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I would recommend this book to a certain age group, mainly because of the language and gore within it. I would say that it would fit teens and older because of all of this. There has been a show made out of this book and it seems to attract teens and older, although it does have the occasional younger age group mainly watching it and maybe reading it as well.

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Chapter 1, pg 4: "A city surrounds the royal capital, and beneath it lives a vast living space, the underground."
Chapter 1, pg 7: "Anyway, we can't afford to lead them straight to our hideout."
Chapter 1, pg 41: "I won't ask about your crimes, in return, you will lend me your strength, and join the survey corps."

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What I ended up liking about the book was the genre and the ending as well. This book is a side story to a series called Attack On Titan, and is based on one of their most loved characters past, Levi. The genre is gore/horror and the ending was unexpected and heart wrenching in my opinion. I believe that seeing the characters grow within the story was interesting, seeing how Levi used to be before he joined the Scouts and right when he did was cool, especially seeing how different his plans were at first and they ended up changing eventually. Within the book, people live within three walls to protect themselves from monsters called Titans, this in a way reminds me of how we, as people kill and eat animals, just like the Titans kill and eat humans in the book.

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Levi and Furlan bring in Isabel into their underground criminal group, training her and teaching her their ways. Levi, Isabel, and Furlan receive a job that takes place on the surface. Once they start to do this job, they're caught by the head of the Scout Regiment, Erwin Smith. Erwin noticed Levi's skill, and offered him to join the Scouts along with Levi's two friends, and he accepts, going on expeditions with the group.