Attack on Titan (2013–2023)

Attack on Titan is set in a world where humanity lives behind massive walls to protect itself from Titans—mysterious, man-eating giants that threaten human survival. The series follows Eren Yeager and his companions as they join the military and uncover the political, historical, and ideological forces shaping their walled society. Blending action, mystery, and shifting moral perspectives, it explores themes of freedom, warfare, identity, and the cycle of violence across an expansive, evolving narrative.

Från IMDB:
After his hometown is destroyed, young Eren Jaeger vows to cleanse the earth of the giant humanoid Titans that have brought humanity to the brink of extinction.