Erwin Smith, a promising figure in the Survey Corps, is humanity's last stand against the monstrous Titans. While Erwin is known for his cold, calculating nature focused on battle tactics, below the surface lies the squalor of the Underground. In this realm of outcasts and debris, Levi, a skilled criminal, navigates a harsh existence. When the paths of these driven individuals intersect, a clash of strength and willpower unfolds, questioning who will emerge victorious.