Attack on Titan is a Japanese manga series written and illustrated by Hajime Isayama. The story is set in a world where humanity lives inside cities surrounded by enormous walls; a defense against the Titans, gigantic humanoids that eat humans seemingly without reason. The story centers on Eren Yeager, his adoptive sister Mikasa Ackerman, and their friend Armin Arlert, whose lives are changed forever after the appearance of a Colossus Titan brings about the destruction of their home town and the death of Eren's mother. Vowing revenge and to reclaim the world from the Titans, Eren and his friends join the Scout Regiment, an elite group of soldiers who fight Titans.

Attack on Titan has been a critical and commercial success, and has become a cultural phenomenon. The series has been adapted into an anime television series, several spin-off manga, light novels, and video games. The story and characters have been well received, and the themes of freedom, identity, and the relationship between humanity and nature have been praised. If you enjoy action-packed stories with complex characters and themes, you may enjoy Attack on Titan.