Shingeki no Kyojin

Eren is a boy who dreams of the world outside the city walls. This fantasy is fueled by the fabulous descriptions of his bookish friend Armin. Even Eren's level-headed foster sister, Mikasa, can't talk him out of it. So what if there are human-eating giants outside the city? As long as people know how to kill them, and the city walls keep the giants out, human civilization can slowly rebuild, and eventually reclaim the world.

That is, until a vastly bigger giant shows up, breaks the wall, and lets its smaller kin access the tasty two-legged treats trying to rebuild their world.

There is a reason why their city is the last human settlement on the planet.

From its relatively modest beginning, the manga managed to become the 17th highest seller in 2010, and a film adaptation was announced for 2013 (whether animated or live-action has yet to be revealed).

This work provide examples of

 * Absurdly Sharp Blade - The soldiers' specialized blades can slice into the giants' weak spots that even cannons have trouble destroying. The trade-off is they are so easy to dull and break, each soldier carries twelve of them and can still run out.
 * The Ace - Rivialle, and to a lesser degree, Mikasa Ackerman.
 * After the End - The giants have taken over the world and the surviving humans have regressed to barely knowing anything else about it.
 * All There in the Manual - At the end of certain chapters, an extra page goes into detail on certain aspects of the world. Examples include a roughly to scale picture of the walls and how much area they protect and details of humanity's technology.
 * Anyone Can Die - And how.
 * Art Evolution - As time goes on, the art starts to get steadily more detailed and the action scenes start getting better, as well as the art of drawing faces.
 * Attack Its Weak Point - The only way to put a giant down for good is to destroy or carve out the base of its neck. Even destroying their head won't kill them.
 * Badass - Anyone who survives more than one encounter with a Titan in general. Notable mentions are Mikasa, Ryner and Rivaille.
 * Barbie Doll Anatomy - Titans. Justified because they really don't have sexual organs.
 * Better To Die Than Be Eaten - One unnamed soldier decides to opt out of the story than be food for the many Titans trying to get into the building he and the rest of his comrades held up in.
 * Bizarre Alien Biology - The Titans ; the fact that how they work makes very little sense is an important plot point, as one of the Scouting Legion's stated objectives is to better understand Titans and how to better defend against them/kill them.
 * Dangerous Forbidden Technique -
 * Despair Event Horizon - Exaggerated by the above example. Subverted with several characters, as they start to wonder if they could ever fight against the Titans yet continue to fight due to an uplifting speech or some sign of hope.
 * Fan Disservice - The one, female Titan has a great figure and is obviously athletic. How obvious? Well, it's hard to ignore all those toned muscles, considering there is no skin to cover them.
 * Good Thing You Can Heal - The titans have a much stronger instinct to munch on humans than to seek safety under cannon fire, which they'll just shrug off, anyway. They can also strike with enough force to destroy their own limbs, then wait for it to grow back.
 * Gorn - Human-Titan battles get messy fast.
 * Grappling Hook Pistol - A pair of these attached to a full body harness is standard equipment for the soldiers, being all that keeps them alive against giants.
 * Healing Factor - An ability inherent in all Titans until they're put down for good.
 * This was the deciding factor in the first battles between Titans and humans, as humanity had possession of weaponry that could easily blow off Titans' heads but they just kept growing back.
 * benefits from this ability after.
 * Heroic Sacrifice - dives into a Titan's mouth to pull  out. He succeeded, but at the cost of being swallowed whole (minus an arm).
 * Humanoid Abomination - Titans.
 * Kaiju - The Colossal Titan. 60 meters (roughly 200 feet) of skinless steaming monstrosity.
 * Kill All Humans/Super-Persistent Predator: Titans explicitly target humans alone, ignoring any other animals they come by. It's not even because they're hungry; they don't need to eat.
 * Last of Her Kind - Mikasa Ackerman whose (mother's) race (called oriental) was wiped out by the Titans. Makes sense given that the walled city's region seems roughly analogous with northwest Europe, so east-asian analog humans would have been for the most part much too far away to take refuge there in time.
 * Mauve Shirt - Titans find recently introduced and named characters to be very tasty.
 * More Teeth Than the Osmond Family - A universal feature of the Titans.
 * No Conservation of Energy - As pointed out by a teacher, Titans produce a large amount of body heat, yet they will only eat humans... who haven't been available to eat in large numbers for nearly 100 years.
 * If the observations about them slowing down when they're deprived of light is any indication, their bodies act like solar panels to absorb and use energy.
 * No Ontological Inertia - A Titan's body quickly dissolves after their death. Arguably justified in that their excessive amount of body heat makes dead Titan flesh spontaneously combust.
 * Not Quite Dead -, and in a surprisingly better shape than before.
 * Ontological Mystery: How and why did the Titans appear over a century back? How did they become so numerous as to make humans an endangered species when they don't even have a way to reproduce? Why is their biology so improbably weird? Where did Were humans more or less technologically advanced before the coming of the Titans? Where exactly in the world is the walled city? Is the setting another world where there are humans, or was it Earth All Along? ? Who (or what) is ?
 * Our Giants Are Bigger - Our biggest giants also lack skin.
 * Parental Abandonment - Eren has to watch his mother get eaten and his father goes missing shortly after. Mikasa technically suffers from this twice.
 * Perpetual Motion Monster - Titans. While they do slow down from certain conditions, they never truly stop until their nape is destroyed.
 * Power Incontinence - It turns out that Eren's was quite uncontrollable, even attacking  As it turns out, he's in some kind of dream state, where things are as they were before the Titans breached the wall. The last time, when he , was also apparently a dream-like state to him. In other words, his sub-conscious might exert some influence on his.
 * The Power of Trust - Horribly, horribly subverted. 'Entrusted' is synonymous with 'doomed, with extra grief and guilt on the side, hold the silver lining'.
 * Power Trio - Eren, Mikasa and Armin.
 * The Power of the Sun - Titans are solar powered. The researchers have to occasionally expose the captured specimens to daylight, so they don't die. They actually don't derive any nutritional value from humans, which leaves in-universe researchers just as puzzled as the readers.
 * Redshirt Army - The Scouting Legion, of which the main characters are an integral part. Their job is to literally "die as heroically as possible".
 * OTOH, the experienced soldiers of the Scouting Legion are also the Badass Army (of the story), especially compared to the Stationary Troops who man and reinforce the walls.
 * Revenge - Why Eren wants to kill every Titan really bad.
 * Schizo-Tech - Humans have cannons and flintlocks for ranged combat. On the other hand, they have pressurized gas grappling hooks.
 * Senseless Sacrifice - The Scouting Legion has a lot of missions end out that way. Unfortunately, the human race is in such desperate straits that continuing suicide missions in the hope that something will pan out someday is probably more sensible than turtling behind walls that have been recently shown to be merely delaying the inevitable.
 * Sleeper Hit: The mangaka originally sent the manuscript to Shonen Jump, but was rejected. Then, he proceed to sent it to Bessatsu Shonen Magazine, a monthly offshoot of Weekly Shonen Magazine. It was a new mag with their only real hit being xxxHolic, which wasn't even the original mag where it was published, it was just being moved there in 2010 from Young Magazine, a seinen magazine. Now, the manga is one of the best selling shounen manga in Japan, surpassing Bleach. See here.
 * Spell My Name with an "S" - Elen or Eren
 * Super-Powered Evil Side -
 * Square-Cube Law - Titans are shockingly nimble for their size. When a researcher cuts one of arms off, it weighs almost nothing in her hands.
 * Takes One to Kill One - Besides incredibly impractical human weaponry, the only thing that easily damages a titan is itself. To the point where one takes out its own head trying to swat someone on its face.
 * Tempting Fate - In a church, a priest preaches that the 3 Goddesses will keep the walls impregnable so long as clergy's faith is held fast. They form a human wall, linking arms, and praying in a circle. A Titan promptly smashes into the church, slaughtering everyone inside, by accident, having been on its way to simply climb over the wall.
 * The Reveal:
 * Troubling Unchildlike Behaviour - Arguably Eren during his childhood, since there is only one flashback of this type of behavior. He took it upon himself to save Mikasa and obviously planned how to kill the criminals that abducted her. He explained why he did this to his father that he "merely put down some rabid dogs. Sometimes they just happen to look like people."
 * Try Not to Die - Mikasa says this to Eren before they part during the Titans' second invasion of the city.
 * Unskilled but Strong - Almost all Titans.
 * Unstoppable Rage - Eren snaps and
 * Wall Around the World: Except for the very first scene, the whole story takes place within walled areas.
 * Weak but Skilled - The only way the inherently physically much weaker humans can survive multiple Titans encounters is to be very skilled.
 * Wham! Episode - Chapter 9,.
 * What Could Have Been - This series could have been published in Weekly Shonen Jump, Isayama Hajime first brought his pilot to Shueisha, but the the editor who evaluated his work said that it was good, but not to for Jump standards; then Isayama gave his pilot to Kodansha (Shueisha's direct rival), he was accepted in no time at Bessatsu Shounen Magazine. The first two volumes sold more than 1,500,000 copies - Jump, and consequently Shueisha, lost a giant new hit to its greatest rival.
 * What Do You Mean It's for Kids? - It may be one of the most relentlessly serious, dark, violent, and horrifying shonen manga in recent memory, easily on par with some of the grimmer seinen out there.
 * World's Strongest Man - Rivialle. He is considered to be humanity's strongest warrior, and for good reason.