Attack on Titan, is a anime made in 2013.
A Short-Story about what happened in 1945.
Titans, gigantic humanoids that eat humans seemingly without reason. The story initially centers on Eren Yeager, his adopted sister Mikasa Ackerman and childhood friend Armin Arlert, who join the military to fight the Titans after their home town is invaded and Eren's mother is eaten.
Eren Yeager, spelled Eren Jaeger in the Funimation dub, is a fictional character
appearing as the protagonist from the manga series Attack on Titan by Hajime Isayama. Eren is a teenager who swears revenge on enormous creatures known as Titans that devoured his mother. In order to defeat the Titans, Eren, alongside his childhood friends Mikasa Ackerman and Armin Arlert, enlist in the Military and join the Survey Corps—an elite group of soldiers who fight Titans outside the walls. As the story progresses it is revealed Eren has the power of becoming a Titan which mankind uses to their advantage to defeat their enemies.
Mikasa Ackerman, Mikasa is Eren's childhood friend who was taken in by his family.She is a quiet and withdrawn girl and maintains a stoic expression, except when Eren is in danger. When Mikasa's parents were killed by slave traders, she went into shock until Eren saves her and motivates her to fight back.As a result, she is very protective of Eren, and follows him wherever she can in joining the military and its related divisions and squads.She is the last-known person of Asian descent residing in the Walls.She graduates at the top of the cadet class,and is regarded by officers as an unprecedented genius and prodigy, easily worth a hundred men in battle.In the author's blog, Isayama notes that her name comes from the Mikasa, a battleship from the Imperial Japanese Navy.
Armin Arlert, Armin is Eren's childhood friend who joins him in the Scouts to order to make a meaningful difference in the world, and to fulfill his dream of seeing the outside world.He initially has an inferiority complex, believing he barely passed the combat graduation exam (but was top of the class academically), and whining that he hates being cowardly and having to rely on friends all the time.However as the story progresses he gains confidence in himself and his abilities when he realizes that he can use his brain.Despite his self-perceived shortcomings, he vigorously defends Eren when the Military wanted to fire cannons at them, and brings Eren out of his feral Titan state following the latter's second full transformation where he attacks Mikasa, Armin convinces Eren to overcome his hesitation to fight Annie. In the military, he impresses the higher-ups by deducing the human identity of the Female Titan.Later chapters describe him as being intelligent, a talented tactician, a deep thinker with good judgment, level-headedness, and ability to think outside the box.During a battle at Shinganshina, Armin comes up with a plan to defeat the Colossal Titan where he acts as bait for Eren to capture Bertolt. The plan succeeds, but his body is severely burned in the occasion.However, Levi saves his life by injecting him with Titan serum, and he acquires the Titan shifting ability after eating Bertolt.