"Attack on Titan" (Shingeki no Kyojin) is a Japanese manga series written and illustrated by Hajime Isayama. Since its debut in 2009, the series has gained immense popularity and has been adapted into a successful anime series, as well as light novels, video games, and movies.

Set in a world where humanity resides within enormous walled cities to protect themselves from Titans, gigantic humanoid creatures, the story revolves around three main protagonists: Eren Yeager, Mikasa Ackerman, and Armin Arlert. After witnessing the destruction of their hometown and the death of loved ones due to a Titan invasion, they enlist in the military to fight against these monstrous beings.

As the narrative progresses, mysteries surrounding the Titans' origins, the walls, and the world outside begin to unravel. The series delves deep into themes of freedom, oppression, sacrifice, and the human will to survive against all odds. With its intricate plot, well-developed characters, and intense action sequences, "Attack on Titan" offers a gripping tale of adventure, despair, and hope.