That Day (Chapter 86)

That Day is the 4th and final chapter of the 21st volume and the 86th chapter overall of the Attack on Titan manga, written and illustrated by Hajime Isayama.

Summary
In the first book found in Grisha's basement, Grisha recounts the day he was first confronted with the cruel world he lived in.

When he was a child, Grisha took his younger sister Fay to see a blimp that was flying above their home in the Liberio Internment Zone. Before leaving their home, Grisha's mother had reminded the two to wear their armbands, and instructed them not to leave the Walls surrounding their District. Fay was delighted by the blimp, and when it finally flew out of sight over their district's walls, Grisha decided to disobey his mother and proceed outside after the blimp. They followed the blimp until it finished its flight, at which point they were found by two soldiers. While one soldier disciplined Grisha for leaving Liberio, the other took Fay away. After his punishment, Grisha attempted to go home, but was stopped by the soldier, who insisted that Grisha watch the blimp with him.

Fay never returned home, and her mutilated body was soon found by the authorities. The soldier last seen accompanying Fay insisted that he had taken her back to Liberio, and pointed out that she never should have been outside in the first place, questioning whether Grisha's parents had been teaching their children of the ancestors' sins. Grisha was convinced that the man was lying, and was disgusted by the way his father sucked up to the man.

Grisha's father attempted to educate Grisha on the sins committed by their ancestors. 1,820 years ago, their ancestor Ymir Fritz made a contract with the "Devil of the Earth", and gained the Titan Power. After Ymir died, her soul split among the "Nine Great Titans", who created the Empire Eldia, which annihilated the Marley Empire. After that, the people of Eldia, the "Subjects of Ymir", began to persecute other tribes they considered "inferior", and began a wave of ethnic cleansing that lasted for 1,700 years. However, Marley began to conspire against the Eldians, and were able to overthrow them after 80 years of war by taking control of seven of the Nine Great Titans. The Eldian ruler, Fritz, built three Walls on Eldia's only remaining land, Paradis, to protect his people. However, some Eldians, including the Yeager family, were left behind. The Marley empire was generous enough not to kill the Eldians left behind, and instead gave them land to live on.

Grisha, unconcerned with his history, demanded to know why the soldier lied about Fay's death, to his parents' horror. His father tried to keep him silent, but Grisha did not see any connection between his ancestors' actions and his sister's death. When he continued asking questions, his father explained that even if they did not do anything directly, they must stay quiet to appease those who they once subjugated, and pleaded with Grisha not to bring Fay's fate upon the rest of his family.

Grisha found his purpose when he inherited his father's clinic at the age of 18. One of his patients was a member of an Eldian resistance cell, and recruited Grisha after revealing the true nature of Fay's death. After learning that Fay had been torn apart by dogs for the soldiers' amusement, he swore to show the entire world that his ancestors' actions were in fact righteous by overthrowing the Marley government.

The resistance had a spy in the Marleyan goverment known only as "The Owl", who provided weapons, funding, and historical documents to the resistance. The documents provided revealed that the Eldians' ancestors did in fact obtain the Titan's power, but that she had used it to bring prosperity to the world. Although he had not been able to read the ancient documents well, Grisha and his compatriots chose to believe that what they had been taught of their ancestors since they were children was false. As they discussed these revelations, a woman named Dina Fritz arrived, having been sent by The Owl. She was a descendant of the Fritz royal family. The information brought by Dina corresponded with the documents from The Owl, and Grisha was able to deduce that the "Progenitor Titan" power possessed by King Fritz would be enough to overthrow Marley. When questioned as to why her ancestor had chosen to retreat despite his power, Dina claimed that it was because of his distaste for violence, and revealed that the war between Eldia and Marley began because of his decision to close himself away on Paradis. Hearing this, Grisha declared that it was the resistance's job to reclaim the Progenitor Titan power for Dina's family, who had stayed remained with their people rather than flee.

The following year, Grisha and Dina married, and had a child they named Zeke. Grisha was confident that his child, who had inherited king's blood, would lead his people to victory.

As the years passed, the Marley government declared that it would be selecting "Warriors" from the Eldian people to fight King Fritz, who had issued a declaration of war against Marley. Only children between the ages of five and seven would be chosen, so as to guarantee that they would be worthy of adopting the Titan's Power, and the families of the children would be made honorary Marley citizens. No one in the Resistance was able to determine why Fritz would declare war, until it was revealed in a letter from The Owl that the Marley government had fabricated the declaration so that they would have an excuse to attack Paradis for its large deposits of fossil fuels. There was no news regarding how Fritz's response to this aggression, other than the warning he had made 80 years earlier when he first retreated: if anyone should ever attack his people, he would loose the hundreds of Titans within his Walls upon the world. In the face of this warning, the Marley government had decided to infiltrate the Walls secretly to take Fritz's power and control the Titans themselves.

With the knowledge that the Marley government was after the same power as them, Grisha decided to give Zeke to the government to become a Warrior so that he would be able to retrieve the power for them. Grisha attempted to educate his son on the pride of being Eldian while simultaneously teaching him to be a loyal Marley Warrior, but when Zeke was seven, he exposed Grisha and Dina's plans to the Marley government, and as punishment they were sent to Paradis, where they would roam as mindless Titans for the rest of eternity.

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Capítulo 86