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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.

The story revolves around a supernatural system where, anyone with a powerful grudge may summon the Hell Girl, a mysterious entity that will exact her client’s revenge with the price of damning their own souls to hell after they die. After torturing the cursed target by letting him/her relive inside her/his own cruelty and injustice, Hell Girl ferries the poor soul into Hell, where eternal pain and suffering awaits them.