Attack on titan Eren yeager is a boy who lives in the town of Shiganshina, located on the outermost of three circular walls protecting its inhabitants from Titans. In the year 845, the first wall is breached by two new types of Titans, the Colossal Titan and the Armored Titan. During the incident, Eren's mother is eaten by a Titan while Eren escapes. He swears revenge on all Titans and enlists in the military along with his childhood friends, Mikasa Ackerman and Armin Arlert. Five years after Shiganshina's fall, the Colossal Titan attacks the city of Trost, near the second wall. Eren helps to successfully defend the city after he discovers a mysterious ability to turn himself into a sentient Attack Titan. This draws the attention of the Survey Corps and their commander, Erwin Smith, who intend to use his power to reclaim Wall Maria. The three are transferred to the Special Operations Squad, under the care of Captain Levi and Hange Zoe. During an expedition into the forest between the walls, Eren and his companions encounter a sentient Female Titan, whom they later expose as their fellow military reg Annie Leonhart. With help from his friends, Eren fights and defeats Annie, who encases herself in crystal and is put in custody. During the fight, it is discovered that there are Titans lying dormant within the walls. Titans mysteriously appear within the walls with no evidence of how they got in, accompanied by the sentient Beast Titan. Ymir, one of the new Survey Corps graduates, reveals that she can also transform into the sentient Jaw Titan while Ymir's close friend Christa Lenz reveals herself as Historia Reiss, a member of the royal bloodline. Two other members of the team, Reiner Braun and Bertholt Hoover reveal themselves as the Armored Titan and Colossal Titan respectively, and attempt to kidnap Eren, but fail. In the occasion, Eren discovers another power within himself called 'the coordinate', that allows him to control other Titans, forcing Reiner and Bertholt to escape, and Ymir willingly flees with them as well, offering herself as a sacrifice to prevent Historia from being targeted by the enemy. Eren and his friends join Levi Squad while the Survey Corps is targeted by the Military Police led by Levi's uncle, Kenny Ackerman. In the occasion, they discover that by transforming into a Pure Titan and eating another Titan shifter, a person can gain its abilities, and that Historia and her father, Rod Reiss, are the only surviving members of the royal bloodline. Reiss kidnaps Eren because he is in possession of the Founding Titan, obtained by his father Grisha upon eating Frieda Reiss, and by Eren through eating his father. Reiss transforms into a monstrous Pure Titan, but is killed by Historia, who declares herself Queen. Having resolved the political unrest, the Survey Corps lead a successful operation to recapture Shiganshi3na, fighting the Beast, Colossal, and Armored Titans but suffering massive casualties wherein Armin gains ownership of the Colossal Titan by eating Bertolt and Erwin dies in a suicide run against the Beast Titan. Eren and his companions return to his home, where they discover the truth of their world: they are actually Eldians, sworn enemies of the conquering Marleyans who were enclosed within the walls after the original King Fritz fled from the war. They are not the last humans as they were told, but rather an enclosed sect of Eldians on an isolated island called Paradis. Because they are 'Subjects of Ymir' who can be turned into Titans by being injected with a special spinal fluid, the Eldians continue to be oppressed by Marley. In the year after the battle of Shinganshina, the Survey Corps kill all of the remaining Pure Titans on the island. Three years later, the Survey Corps attack Marley's capital, Liberio, orchestrated by Eren and his half-brother Zeke, who is the owner of the Beast Titan. In the occasion, Eren kills Willy Tybur, who had been controlling Marley from the shadows and gains ownership of the Warhammer Titan after eating its previous owner, Tybur's sister. However, Eren is imprisoned for acting against orders but escapes with a faction of extremist Paradis soldiers called the Yeagerists. Zeke is kept into Levi's custody but manages to escape, severely injuring him. Marley's air fleet, led by Reiner launch, an invasion of Paradis, and war breaks out. Eren and Zeke reunite, which leads them to the Paths, an interconnecting series of gateways connecting all Subjects of Ymir through time and space where they meet the consciousness of Ymir Fritz, the original Titan, whose tortured past has led to her imprisonment within the Paths for thousands of years. Zeke attempts to convince Ymir to fulfill his wish to stop the Subjects of Ymir from reproducing, but instead, Eren convinces Ymir to use her power to unleash the Rumbling, unleashing thousands of Colossal-like Wall Titans kept within Paradis' walls and leading them on a genocidal march to kill everyone outside the island. The Survey Corps ally with remaining Marley forces, including Reiner and a now-freed Annie to stop Eren. After they kill Zeke and a mysterious creature who is the source of all Titans' power, Mikasa kills Eren, which makes the power of the Titans vanish, returning all humans turned into Titans back to normal. It is revealed that what transpired was part of Eren's plan all along to spare twenty percent of humanity with Armin and the others being recognized as heroes for killing him. Three years later, as Paradis and the rest of the world rebuild, Armin and his allies begin peace negotiations led by Queen Historia. Mikasa buries Eren underneath a tree on a hill near Shiganshina District, which grows into a tree resembling the one where the organism that granted Ymir her Titan power lived. An unspecified amount of time after Mikasa's death, Shiganshina is reduced to rubble in a war. a boy approaching the tree, which has become surrounded by forest.
