Primal Desire: The Struggle for Trost, Part 9

Primordial Desire is the thirteenth episode of the Attack on Titan anime. It was produced by Wit Studio and Production I.G. It shows Eren finally lifting up the boulder and carrying it to the hole in the wall, with other soldiers sacrificing themselves in order to protect him and then describes the aftermath of retaking the Trost District operation.

Overview
While soldiers continue to die in order to protect Eren, Jean attempts to take the 3D Maneuver Gear of a dead soldier in order to escape. Marco arrives to assist him, soon followed by Annie and Connie and together, they manage to evade the Titans and escape to the top of the wall. That is when Eren finally picks up the boulder and heads towards the hole, followed by the soldiers determined to die. Eventually, the hole is plugged up and Mikasa, Armin and Rico Brzenska find themselves protecting Eren against a horde of Titans, until Levi arrives to slay them. After the operation, soldiers have to gather the corpses and it is revealed that Marco is one of them, much to Jean's shock. Some time later, Eren wakes up in a cell and after expressing his desire to kill Titans, Levi decides to take care of him as his Captain of Survey Corps.

Summary
The elite soldiers continue the struggle to defend Eren. However, Rico's squad ends up completely wiped out, leaving only her and one female soldier. As they are forced to retreat to the boulder's location, they witness the arrival of more Titans heading their way.

At this time, Jean is attempting to take a dead soldier's 3D Maneuver Gear as his own one broke, while being watched from top of the wall by Annie, Connie and now Marco as well. Having trouble with their gear, Jean is approached by a Titan. Thankfully, Marco manages to distract the Titan, giving Jean time, and acquire the gear and escape. Connie and Annie also rush for help, and when Jean finds himself having difficulties controlling the gear, Connie distracts the Titan pursuing him in order to distract it. Jean finally manages to control the gear just to be approached by another Titan, however, he ends up being ultimately saved by Annie and all four of them successfully land on top of the wall. Suddenly, they hear loud footsteps and much to their surprise, they witness Eren, in his Titan form walking towards the gate, carrying the huge boulder.

The elite team, along with Mikasa, also watching in surprise, is approached by Armin who tells them that "Eren won," and is trying to do his job now. He notes that if he manages to reach the gate, they will win. Seeing this as their ultimate chance, Ian orders the soldiers to protect Eren, even if it costs their lives. Jean, Annie, Connie and Marco also descend from top of the wall with an intention to support Eren. Afterwards, Ian tells Armin and Mikasa, to go directly to Eren, and then goes into action himself, but suddenly stops, surprised to see Mitabi and his squad approaching the Titans on ground. Armin claims that staying on ground is suicide, but Ian states that it's the only way they have left and heads down to successfully distract a Titan, creating a way for Eren.

As Eren keeps walking towards the hole, he notices Armin and Mikasa and gets worried that they might get eaten by Titans. The soldiers continue luring the Titans, however, some of them are caught by them, including Mitabi, who gets crushed by a Titan's hand. Eren then recalls Armin questioning his motive for going outside. He states to himself, that, "when people are born, they are free and people who deny that, no matter how strong they are, don't matter." Believing that seeing the world outside would make one the freest person, he keeps walking forward, determined to fight, no matter how cruel the world is.

Meanwhile, the soldiers keep falling into Titans' hands and Mikasa and Armin witness Ian Dietrich throwing a soldier out of a Titan's mouth, only to be decapitated, and eaten himself. As one more Titan stands in Eren's way, Rico charges forward, cutting through its eye, with Mikasa finishing the job. Finally reaching the hole, Eren, while being encouraged by Armin, drops the boulder, successfully blocking the breach in Trost. With tears in her eyes, a relieved Rico says that the soldiers didn't die in vain and shoots a yellow signal flare as a message that the mission has been accomplished. Seeing this, Dot Pixis immediately orders to send reinforcements and rescue the elite team.

With more Titans approaching, Rico exclaims that they have to climb the wall as soon as possible, but Mikasa rushes to Eren who is still partially attached to the Titan's body. Rico quickly decides that they have to cut him off, and she herself does the job. However, at that moment, two Titans reach them and as they are about to attack, they are slayed by a mysterious soldier. But then, Eren spots the "Wings of Freedom;" the symbol of the Survey Corps on the soldier's back. As the soldier approaches them, their savior turns out to be Captain Levi. Standing atop of the killed Titan, Levi looks at Eren and friends, and questions the situation.

After that, both Stationary Guard, and Survey Corps keep eliminating the Titans trapped inside Trost. Thanks to the cannons and Survey Corps's prowess, the area of Trost becomes free of Titans after a whole day of fighting. Not only that, but two Titans are also captured alive. However, while mankind finally manages to win against the Titans, the price paid in exchange is far too high as a lot of soldiers have died or are injured.

Having to deal with the aftermath of the battle, Jean is then seen going through the corpses. Much to his shock, he then witnesses a corpse of Marco. Unable to believe this, he questions what happened. However, he is then approached by a medic who asks Jean for the deceased's name. After hearing that they're still collecting corpses in order to avoid an epidemic and knowing the names is helpful, Jean tells her Marco's name and his position as a soldier. Elsewhere, Sasha witnesses a lot of corpses as well. Questioning this, she is told by a soldier, much to her disbelief, that they're corpses that were thrown up by a Titan. At the same time, Annie is also looking at a corpse of a soldier, apologizing to them. Reiner, however, tells her that an apology won't fix it so they should just put them to rest.

At an unknown place, Eren suddenly wakes up, and is being interrogated by Erwin Smith and Levi of the Survey Corps. After being told that he is in an underground jail cell, and in the custody of the Military Police, Eren notices that Erwin is holding a key to the basement of his former house. Stating that he will give it back to Eren later, Erwin tries to confirm whether the basement holds the secrets of Titans, to which Eren replies that it's what his father said. Not trusting him, Levi states that it's convenient for Eren to have amnesia while his dad is missing, but Erwin insists that Eren has no reason to lie. When Erwin asks him what he wants to do later on, Eren replies, with a smile, "I want to join the Survey Corps and kill as many Titans as possible, sir!" This catches Levi's interest, as he walks forward, and says that he will take care of Eren, not because he trusts him, but because he can kill him if Eren betrays them. He then tells Eren that he will accept his application to the Survey Corps.

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