In a world of enemies wearing familar faces, even loyalty casts a shadow. Sera Darley was created to disappear. For years, she's lived as Commander Erwin Smith's ghost, an officer who only exists on paper, watching from the shadows of the 104th. Her purpose was simple: observe, report, and remain unseen. But when Erwin begins to question the silence and restraints in her reports, he sends Captain Levi Ackermann to bring her back into focus or uncover what she is hiding. The closer he gets, the more the lines blur between mission and understanding. In her, Levi recognizes the same discipline and the same exhaustion that keeps him alive.