Attack on Titan is a Japanese manga series written and illustrated by Hajime Isayama. Its events take place in a fictional world where humans live inside lands surrounded by three huge walls that protect them from giants who eat humans. The events begin when one of the walls, Wall Maria, is breached, where the giants exterminate a third of humanity. The manga series debuted in Kodansha's Besatsu Shōnen magazine on September 9, 2009. It has been collected into 28 tankōbon volumes as of April 2019. The Attack on Titan series has been a commercial success, and as of April 2019, nearly 90 million tankōbon copies have been in print. worldwide (80 million in Japan and 10 million outside Japan), making it one of the best-selling manga series. She has won numerous awards, such as the Kodansha Award for Manga, the Michelosi Awards, and the Harvey Award.
The series tells the story of Eren Yeager, Mikasa Ackerman and their friend Armin Arlert. After the outer wall is breached by the Titans, including the 60-meter Colossal Skinless Titan and the unusually intelligent Armored Titan, and Eren's mother dies as a result of the resulting destruction, Eren swears revenge on the Titans and later volunteers to join the army, accompanied by Mikasa and Armin. Five years after the graduate apprentices stationed in Trost County, one of the border towns jutting out from Wall Rose has been attacked by giants once again. In the battle that the protectors began to defend, Eren saves Armin from eating the giant, so Eren eats a giant that appears later and begins fighting with the giants, while humans ignore the giant, revealing that he is Eren, who has the ability to transform into a giant. Even though he was seen as a threat, he helped the army retake the Trost neighborhood. After being put on trial for being a danger to humans, he joins the Survey Corps in a special operations squad led by Captain Levi. On the 57's expedition to Shiganshina (the province that was destroyed 5 years ago) where the Vault where the secrets of the Titans are located, the scouts are attacked by a Female Titan who is trying to kidnap Eren. Although the scouts captured the female giant, she later broke free and killed all the members of Levi's squad, forcing the expedition to retreat. Armin determines that the Female Titan is Annie Leonhart, one of the cadets that taught Eren to fight. So they hatched a plan to catch her in Stohes County. During this process, much damage was left, they discovered that the giants are inside the walls surrounding the human settlements.
Eren discovers that some of his friends are capable of turning into giants, and they were sent as spies by an unknown party to find the so-called "Coordinate". It is later confirmed to be the original power of the ability to control titans, and that Eren possesses that power. The royal family and the military police want Eren and his girlfriend Christa Lenz, whose name is Historia Rice and she is the real queen. The Expeditionary Corps, experiencing the revolution's success in overthrowing the monarchy, learns of Rod's death at the hands of his daughter, Historia, who becomes the new queen. It is then revealed that the Rice family was responsible for creating the walls 100 years ago using the Coordinate, which was stolen from them by Eren's father Grisha, who was passed on to Eren by turning him into a Titan, before allowing his son to devour him. Utilizing Eren's new power of permanent hardening, this time the Survey Corps manage to reach Shiganshina to restore Wall Maria and seal the hole. However, Zeke sets a trap for them, as he leads an army of giants and there is also the colossal and armored Titan. The battle ends with Zeke and he retreats, the colossal giant was defeated by Armin, which led to his body burning, then they put an injection on him during his death and then he turned into a giant, and ate Bertholdt and Armin became transformed into the colossal giant, but at the cost of the lives of nearly all the members of the Legion who were exterminated, Including the commander of the Survey Corps, Erwin Smith.
Before returning, the survivors of the Survey Corps wanted to go to the basement of Eren and Mikasa's house, and found evidence that human civilization beyond the walls is not extinct as they believe, but, in fact, is thriving. However, they also discover that their Eldian race, oppressed and persecuted by the Marelians - the ruling race who subdued them on Paradise Island (the island with the walls) and seized its natural resources - turned the Eldian captives into unconscious giants to ensure their confinement within the walls and sent Reiner, Annie, and others of mutants giants to steal the power of the coordinate. Eren also knew that Zeke was his older half-brother, who betrayed his father and turned to the Marlin. After repairing Wall Maria, Eren prepares the others to face Marley's forces. The story then shifts to four years later, where Marley has giants like Kzek and Reiner, as well as trained warriors to inherit their powers due to the fact that the giant's powers only have 13 years left. Marley is fighting another country called the "Mediterranean East". Although Marley wins the war, it is destroyed thanks to a new invention to combat the titans with artillery that can seriously harm. Most of the fort well was destroyed by giants.