Annie Leonhart is the daughter of a well regarded scientist, Dr Leonhart (we don't know his name), her friends Bertholdt and Reiner are thinking of going with her to join the military.

One day while they go pick up some firewood together a lightning bolt strikes the outside wall. Everyone stopped for a moment to watch but just as fast go back to what they were doing, the walk begins rumbling and everyone stops and stairs as the wall is torn down by a Titan, a Titan with a misshaped jawline and messy black hair.

Titans start piling in seemingly out of nowhere as another noticeably different Titan breaks down buildings. The military start trying to attack but are stopped, Annie runs to her house and finds her father trapped under rubble, she tries to free him but realises that a Titan is getting close, Annie's father tells her to run but Annie doesn't want to but she had never argued with him before so she starts running, not looking back at what could be happening to her father.

After the city had been evacuated to the middle wall she reunited with her friends, her only friends and tells them what happened. Bertholdt says that her father is probably dead which makes Annie only more scared.

Annie never forgot that day and kept in mind to join the military training corp with Bertholdt and Reiner which they eventually did five years later.

The trio join the training corp and start their new lives, during hand to hand combat training Annie starts doing her training with someone called Eren Jaeger, he changes the way she sees somethings as he always talked about the world and how it was, he also showed her some martial arts moves that would be useful if they ever had to punch Titans for some reason.

At the ceremony Eren's friends Mikasa and Armin get first and second places, Eren got third and Annie got fourth while Bert and Reiner made it to fifth and sixth, the rest of the top ten places were given too Jean, Marco, Ymir and Christa. Eren decided to join the military police with Marco while the rest of the top ten joined the survey corp.

During their first mission Annie gets injured and Reiner almost dies but Annie pulls him out of the Titans mouth and she gets eaten instead. After that Reiner tells Bertholdt that Annie died and he almost bursts into tears. Bertholdt tells everyone the bad news and everyone is shocked, the look on Eren's face shows that he's really sad about it.

Just as Bertholdt is about to be attacked by a Titan a different looking Titan with a very feminine body type saves him, Eren looks at the Titan in a strange way. After a lost battle the feminine Titan loses its skin starts moving and Annie pops out. Bertholdt, Reiner and Eren all run down to her.

Annie comes too and sees everyone around her, she isn't fully aware why. Someone shouts at her "are you a human or a Titan", she is now aware of what happened to her and says she's a human but most people don't trust her, Eren eventually talks everyone out of it but as he finishes more Titans start invading.

The survey corp start to engage, the three boys by Annie tell her to shift and attack, Annie is unsure if she can control it but Eren reminds her that she had it under control before. Reiner comes up with the idea of using a giant rock that was thrown by a Titan inside the walls to fill up the hole.

Annie shifts and Eren guides her to the rock as Bert, Reiner and other survey members take down Titans. Eren lands on the rock and shouts at Annie to lift it up which she eventually does. Eren guides her to the walls, a Titan tries to attack her but Bertholdt takes it out, Annie puts the rock down and collapses out of exhaustion. The three who helped her the most on this mission try to get her out of the muscles but hear a voice they don't want to argue with. Annie blacks out.

Annie wakes up in a jail cell, in front of her are bars, behind the bars are two men, one tall and one short. They tell her that she has to go to court, she decides to keep her mouth shut.

She is taken to court, pushed to her knees and strapped to a pole. Annie looks around and sees all three branches, Garrisons on the right, military police behind her and the survey corp to the left. She sees Bertholdt and Reiner worried for her, behind her Eren is curious what's going to happen.

She stays silent in court as the judge and Erwin are arguing, as they keep talking Levi comes up to Annie and starts beating her up with everyone watching confusedly with Bert and Eren having rage in their and their friends holding them back.

Eventually the judge comes to a decision for Annie to serve the Hange squad for a time. Hange takes her to her quarters. She gives her an cleaning outfit and tells her to get into it, she does and asks why to which Hange replied with "don't argue with me, I'm your boss and know your gonna help me clean", Annie is confused but didn't want to keep arguing with everyone.

After that the two go to the dinning hall another person comes into the hall and is excited to see Annie. "This is Levi, you two are gonna go do some experiments together."

After a few days and a few experiments Annie goes on a mission into Titan forest with the Hange squad.

The Survey corp are on a mission in Titan forest. Reiner, Armin and Jean go separate ways from the rest of the corp to scout out the forest, their hoods are up as that is compulsory for soldiers with no ranking. As the three go deeper into the forest they start to hear loud sounds that they can't quite make out what it was, as the sound got louder they started to sound like footsteps, Reiner looks back and sees the Titan who broke the walls down all those years ago.

The Titan tries to attack Armin who just barely avoids the large fists coming down at him. Reiner tries to get a good shot of the neck, as he comes closer to the neck but just as he goes for a killing blow the Titans neck sets itself alight with Reiner getting burned in the process. Reiner falls to the ground and waits as Reiner and Jean are dealing with the Titan.

The Titan backhands Jean away from them and he can't get back, Reiner is still on the ground trying to shout at Armin what to do but they couldn't take it. Reiner just stays still as feels as he moves the Titan will be quicker and kill him, he only feels the hood of his cape move, he moves his eyes and sees that the Titan looking at him.

The Titan runs away and Armin and Jean come to Reiner and asks what happened, Reiner just is silent thinking "it's intelligent, how."

Annie continues to go forward with the Hange squad when they start hearing footsteps and they look back to see the Titan who attack the three before. Annie is unsure if she should shift with the Hange squad just trying to get away from it, while Annie is deciding multiple members of the squad are killed. Hange shouts at Annie "make a choice" and Annie decides to shift.

Annie's Titan emerges from smoke and immediately tackles the other Titan down and mounts it and tries to punch it but the Titan, she tries again but it moves again. The two stop for a second and look at each other.

Annie roars at the Titan who didn't flinch and grabs Annie's arm, Annie tries to get it off her but it just kicks Annie into a tree, the Titan tries to get up but Annie gets up quicker and punches it which knocks.

The Titan tries to get up, it notices Annie about to attack it, it puts its hand out as if it wants Annie to stop, it hasn't acted like that before which confuses the soldiers watching the fight. Annie, in her rage, still tries to punch it without thinking it over but the other Titan dodges.

The Titan gets into a fighting stance and Annie throws multiple punches at the Titan but the Titan dodges all of them and punches Annie in the face, Annie hits the Titan in the gut with enough force to have the other Titan be thrown through the air until it hits a tree and falls back to the ground. Annie goes to knee the Titan in the head but the Titan gets out the way and Annie hits the tree.

Annie goes to attack again but the tree she hit falls and crushed her head and cuts off her hand, the other Titan gets out of the way from the falling tree and the remains of Annie's Titan body falls to its knees. The other Titan comes over to her, it waits a second before doing anything and puts it hand on Annie's shoulder, it opens its mouth and bites off some of the internals of Annie's Titan exposing Annie's human body.

Bertholdt comes in screaming "Annie" but Annie gets eaten by the Titan and it starts to leave. Bertholdt chases the Titan and starts to attack it and makes it fall down but every time after that the Titan starts lighting its body on fire when Bert gets closer. Bertholdt attempts to go for a finishing blow but Hange stops him and tells him to wait.

Levi waits for a good time to attack and eventually goes in and attacks it up his arm and in his eye, he lets himself go down to the ground and cuts his ankles which makes it fall to the ground. Bert goes to attack the nape, Levi yells at him not to do it. As Bert gets closer the Titan tries to put it hand up to crush him, Levi puts kicks the Titans hand to make it stop and attacks the Titans nape, the Titan doesn't die but Annie comes out of its mouth covered in Titan saliva, unfortunately for Hange she broke his leg when he kicked the Titans hand.

Hange grabs Annie and tells Bertholdt that there getting out of there and that Annie is alive, as they leave with Annie a tear comes down from the injured Titans eye.

Annie wakes up in a cart and Bertholdt tells her they failed and she sees a group of civilians praising the corp. When she gets better Bert tells her about a plan that him and Reiner came up with to get her out the city to avoid the monarchy as she broke a lot of laws.

Eren wakes up and gets to work with the Military police, when his group start walking ahead of him Reiner brings him into an alley and explains the plan to him and he agrees.

Eren takes the three to a underground tube but he stops at the top of the stairs. Annie tries to get him to come down but Bertholdt yells at Eren "il kill you, Titan", Eren laughs in relief and hidden soldiers come and gang up on him, they restrain him but he shifts by using a ring with a spike in it to cut his fingers.

Reiner explains to Annie and a team in the underground pipe that they had suspicions that Eren was the Titan that Annie had fought in the woods and the one who broke the wall years ago. Annie denies it, Bertholdt asks her if she has special feelings for him. Reiner comes up with a plan for Bert and him to distract Eren and for Annie to come up behind him and cut his neck.

The two go to fulfil there roles but Annie bites her thumb and shifts which brakes the ground and she uppercuts launches him to a church and crushes the people inside it except the priest. Eren starts running towards the wall and members of the survey corp try to take out his limbs and nape but all the places they try to cut Eren sets on fire.

Annie starts running for Eren, while Annie is running for Eren she thinks back to the times she had and that Eren taught her to treat the world as your enemy, and that his father taught him pointless martial arts but the only time he came out was when he was using his skills, "I remember thinking that you were a bad lighter" Annie thinks.

Eren sweeps Annie's leg and breaks it off but Annie jumps up on her one leg and punches Eren in the face. When she gets back on the ground Eren roundhouse kicks her which takes off part of her face.

Eren runs for the wall and starts to scale it but Bertholdt cuts his fingers off and pushes him down. When Eren is falling down he thinks back to his time with his dad and that he told him to come back. Annie got up when Eren was falling and when Eren hits the ground she roles him over and looks at the nape.

Soldiers cut her nape but make sure not to stab him and they cut enough internals for Eren to be revealed, Annie puts her hand out to get Eren out of the body. Eren face has tears streaming from his eyes and fear in his face. When Annie puts her hand around Eren her hand starts shinning and Eren is incased in a crystal that Annie made and she puts the crystal down.

Annie is taken out of the Titan by Levi and given to Reiner, Annie wakes up and asks Reiner "where's Eren" and she sees soldiers trying to brake the crystal that she made. "You made that crystal Annie, like Eren can make fire."

Eren is put in a underground prison, Annie is put in a hospital bed with Bertholdt and Reiner by her side. When Annie get better she goes to see Eren in the crystal, she puts her hand on the crystal as she sees the tears in his eyes, she ask Eren "what were you fighting for, what made you kill all those people" but Eren can't hear.