Attack on Titan: Complete Lore Attack on Titan takes place in a world where humanity seemingly survives behind three enormous walls: Maria, Rose, and Sina. Beyond them roam Titans, gigantic humanoid creatures that devour humans. Unknown to most citizens, their civilization exists on Paradis Island, isolated from a world that fears their ancestry. Origins: Nearly 2,000 years earlier, Ymir Fritz gained the Power of the Titans after encountering a mysterious organism. Following her death, her abilities divided into Nine Titans, inherited by Eldians. The Eldian Empire used Titan powers to dominate other nations until Marley gained control of most of them. King Karl Fritz retreated to Paradis, built the walls using Colossal Titans, and erased his people's memories. Main Characters: - Eren Yeager: Determined, impulsive soldier obsessed with freedom. Inherits the Attack Titan and Founding Titan. - Mikasa Ackerman: Exceptionally skilled, protective warrior devoted to Eren and her friends. - Armin Arlert: Intelligent strategist who dreams of exploring the outside world. Later inherits the Colossal Titan. - Levi Ackerman: Humanity's strongest soldier, renowned for his precision, discipline, and intimidating personality. - Hange Zoë: Brilliant, eccentric Titan researcher who eventually commands the Survey Corps. - Erwin Smith: Charismatic Survey Corps commander willing to make enormous sacrifices for humanity's survival. Season 1: The Colossal and Armored Titans breach Wall Maria, allowing Titans to invade Shiganshina. Eren witnesses his mother's death and vows to eradicate every Titan. He joins the military alongside Mikasa and Armin. During the Battle of Trost, Eren discovers he can transform into a Titan. The Survey Corps recruits him, hoping to use his abilities. Annie Leonhart is exposed as the Female Titan and seals herself inside a crystal. Season 2: Titans mysteriously appear within Wall Rose. Reiner Braun and Bertholdt Hoover reveal themselves as the Armored and Colossal Titans, undercover warriors from Marley. They kidnap Eren, but the Scouts pursue them. Eren briefly activates the Founding Titan's power, unknowingly commanding nearby Titans. The conflict reveals that humanity's history has been deliberately concealed. Season 3: The Scouts uncover corruption within the royal government. Historia Reiss becomes queen after learning her family's connection to the Founding Titan. Eren discovers his father, Grisha, stole the Founding Titan from the Reiss family. The Scouts return to Shiganshina, battling Reiner, Bertholdt, and the Beast Titan, controlled by Zeke Yeager, Eren's half-brother. Erwin dies following a desperate charge, and Armin nearly dies defeating Bertholdt. Levi chooses to save Armin with Titan serum, allowing him to inherit the Colossal Titan. Inside Grisha's basement, the Scouts discover humanity exists beyond the walls. Marley oppresses Eldians, using them as weapons of war. The Scouts eventually reach the ocean, but Eren realizes their enemies remain across the sea. Season 4: Four years later, Marley fights foreign nations while preparing to attack Paradis. Eren infiltrates Marley and launches a devastating assault, killing civilians and military leaders. He gains the War Hammer Titan and returns home, increasingly alienated from his friends. Eren secretly cooperates with Zeke, whose plan would prevent Eldians from having children. However, Eren betrays him and accesses the Founding Titan through Ymir Fritz. He initiates the Rumbling, unleashing countless Wall Titans to destroy civilizations beyond Paradis. The Final Battle: Former enemies unite to stop Eren, including Mikasa, Armin, Levi, Reiner, Annie, Jean, Connie, and Pieck. Hange sacrifices her life to help the alliance escape, leaving Armin as commander. The alliance confronts Eren's enormous Founding Titan. Levi defeats Zeke, while Armin battles Eren using his Colossal Titan. Mikasa ultimately kills Eren, ending the Rumbling and freeing Ymir from her attachment to King Fritz. Ending: Eren's death ends the Power of the Titans, restoring surviving Titan shifters to ordinary humans. Approximately 80% of humanity has perished in the Rumbling. Armin and his allies pursue peace between Paradis and the surviving nations. Mikasa buries Eren beneath the tree where he once slept, visiting his grave throughout her life. Legacy: Attack on Titan explores freedom, oppression, inherited hatred, sacrifice, revenge, and the consequences of war. Its characters discover that humanity's greatest enemies are not simply monsters, but cycles of fear and violence perpetuated across generations.