Mitras, being the royal capital, is the cultural and economic center of the walls. The city is inhabited mainly by people from the upper class and close to the royal family, enjoying a rich, and quiet life far from the threat of the Titans.
It is the residence of the King and upper-class citizenry. One may also earn residency rights through meritorious service in the Garrison Regiment or Military Police Regiment, which is considered the sole means for the poor to gain safe refuge.
After the arrest of Erwin Smith, the leader of the Scout Regiment, various officials gather to the capital in order to execute him. Erwin is arrested for the alleged murders committed by the Scout Regiment, and is brought to Mitras for his audience with the king. Public gallows are erected in expectation of his execution. Nile tells Erwin that he expects Erwin to be dealt with at the same time the Scout Regiment is disbanded.
Erwin defends the necessity of the Scout Regiment to the king and the other high ranking members of the Royal Government, but his words fall on deaf ears. Seeing that they are unmoved, he asks if they have a secret plan as an alternative. The officials redirect the subject to several of Erwin's violations, ultimately stating them as treason. After asking Dot Pyxis for his opinion, the nobles confer, and then one of the nobles announces Erwin's sentence to death.
As Erwin is brought to his feet to be taken away, Anka Rheinberger bursts into the throne room and declares that Wall Rose has been breached by the Colossal and Armored Titans. Pyxis rouses his soldiers, but Aurille countermands his order and calls for the closure of the gates to Wall Sina be shut to all refugees. Nile protests that doing so will sacrifice half of humanity, but the officials do not care because that number of refugees might be enough to spark a civil war. Nile declares that he refuses to close the gates of Wall Rose, even if it means opposing the crown.
Commander-in-Chief Dhalis Zachary enters the room with an armed entourage of soldiers, announcing that he will join him. Zachary explains that the previous report was inaccurate and no Titan attacks have been confirmed. When the officials protest, Pyxis admits to orchestrating this charade as a test, declaring it as a coup d'état. Erwin informs the officials that they would be violating the Charter of Humanity had the false disaster actually happened, and proceeds to ask about the gravity of installing a false king on the government.
The corrupt royal government is taken down and arrested by General Dhalis Zachary and his forces in a coup d'état. The military announces their seizure of the capital from atop the scaffolding where Erwin was to be executed to the population of Mitras, which is gathered in order to be informed of the current situation within the Walls. With the corrupt government and the false King being placed under arrest, they are eager to learn the identity of the true royal family and the formation of a new military government.
Zachary and Erwin depart in a carriage. Erwin expresses regret over the coup d'état because no matter how corrupt the government had been, it had kept humanity alive up until the present day. Zachary is surprisingly insightful about Erwin's true motivation. Like him, Erwin values his own life over the fate of humanity, and that is why he was willing to let others choose the harder path instead of giving up and leaving everyone on the easy one. Erwin remembers his childhood dream regarding the truth about humanity's escape to the Walls.
After the battle against Rod Reiss in Orvud District, Historia Reiss, the only remaining member of the true royal family, declares herself the true ruler of the Walls, and is crowned as the new queen in the royal capital during a coronation ceremony. She is admired for being the one to defeat a Titan twice the size of the Walls. Various military officials kneel before her, and thousands of citizens thunderously cheer for her as she stands proudly.