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"Attack on Titan," also known as "Shingeki no Kyojin" in Japanese, is a popular Japanese manga and anime series created by Hajime Isayama. The series is set in a world where humanity is on the brink of extinction due to gigantic humanoid creatures known as Titans. These Titans vary in size and appearance but are uniformly terrifying and seemingly mindless, driven by a hunger for human flesh.

The remnants of humanity reside within enormous walled cities to protect themselves from the Titans, which are unable to breach the walls. The story follows Eren Yeager, his adoptive sister Mikasa Ackerman, and their friend Armin Arlert as they witness the sudden breach of their walled city by a colossal Titan, leading to the destruction of their peaceful life. Eren vows to eliminate all Titans and joins the military to fight back.

As the story unfolds, Eren and his companions uncover dark secrets about the Titans, the world they live in, and the truth behind the walls. They discover that not all Titans are mindless, and some are capable of taking on human forms. These humanoid Titans, called "Shifters," play a crucial role in the conflict. The narrative explores themes of survival, freedom, sacrifice, political intrigue, and the blurred lines between good and evil.

The series gained immense popularity for its intense action sequences, complex characters, and intricate plot twists. It became known for its morally gray characters, who often face difficult choices and internal struggles. "Attack on Titan" explores the impact of war, oppression, and the desire for freedom on both individuals and society.

The anime adaptation brought the manga to a wider international audience, further cementing its popularity. The series concluded with its 139th chapter in the manga, and its anime adaptation concluded its final season, revealing the long-awaited conclusion to the story.