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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.

Kaizaki Arata is a 27-year-old, out-of-work man who has failed at each and every job interview he has had after quitting his last company where he only lasted three months. His life changes after he meets Yoake Ryou of the ReLIFE Research Institute, who offers him a drug that can change his appearance to that of a 17-years-old again.

After failing his college entrance exams, 18 year-old Tsukasa Mizugaki is offered a position at the renowned SAI Corporation due to his father’s connections. SAI Corporation is known for its production and management of androids that possessed human emotions called Giftia.