Following the disastrous results of the 57th Expedition, Eren is to be brought to the King’s palace for a court martial. Armin, desperate to save Eren from certain execution, enlists the help of an old friend to assist with an escape plan.

On the day before the 57th Exterior Scouting Mission, Hitch gives Annie Leonhart the task of finding a missing person, Carly Stratmann, the daughter of a wealthy merchant in Stohess District. She visits the Stratmann family mansion to ask Carly's father, Elliot G. Stratmann, about the circumstances that may be related to her disappearance.

After her horrifying discovery, Annie decides to cover it up and locate Carly Stratmann to prevent the case from interfering with her current mission.