Attack on Titan Vol 1 by Hajime Isayama

In a post‑apocalyptic world, humanity teeters on the brink of extinction. Gigantic humanoid beasts known as Titans roam the land, consuming humans without purpose or mercy. To survive, the remnants of humanity have retreated behind three massive concentric walls—so enormous that they dwarf even the Titans themselves.

For over a century, those within the walls have lived in relative safety, believing the barriers to be impenetrable. But peace shatters when the outermost wall is breached by a colossal Titan that appears from nowhere, granting the smaller Titans access to the inner sanctums. The horror unfolds, and with it, questions about what life has become—and what sacrifices will be necessary to reclaim it.

Enter Eren Jaeger, a young man driven by rage and loss, whose burning desire is to fight back. Alongside his adoptive sister Mikasa and childhood friend Armin, Eren joins the Survey Corps—those who venture beyond the walls to battle the Titans and uncover the truth about their origin. But the deeper they dig, the more they realize that some truths might be more terrifying than the Titans themselves.

Adventure, mystery, and despair collide in this debut volume of Attack on Titan, a manga that has captured readers worldwide. Winner of the 2011 Kodansha Manga Award for Shōnen and nominated for the Osamu Tezuka Cultural Prize, it delivers a brutal, gripping start to an epic tale of human resilience in the face of monstrous forces