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[[caption-width-right:350:That white is gonna ''stain.'']]
The latest, ongoing manga by TsutomuNihei, creator of ''Manga/{{Blame}}'' and ''{{Biomega}}''. Set on the gigantic GenerationShip Sidonia, the last remnants of humanity are engaged in a seemingly HopelessWar against the monstrous Gauna. Nagate Tanikaze has lived in isolation in the bowels of the Sidonia his whole life, with only his recently deceased grandfather and Guardian pilot simulator for company. Facing starvation, Nagate journeys to the surface in an attempt to steal from a food processing plant, before being injured and captured by local authorities. Upon discovering his "grandfather's" storied past as a previously important Guardian pilot, the government puts Nagate on the fast track for elite Guardian pilot training. What follows are Nagate's attempts to fit in with civilized society, his growing relationships with his fellow students, and his growth as a pilot in the face of the horrifying threat of the Gauna.

An [[http://www.animenewsnetwork.com/news/2013-05-16/tsutomu-nihei-knights-of-sidonia-manga-gets-anime anime adaptation]] premiered on April 10, 2014. It is being produced by Polygon Pictures, the [=3DCG=] studio behind ''WesternAnimation/TransformersPrime'' and ''WesternAnimation/StarWarsTheCloneWars'', as its 30th anniversary work. Watch the first trailer [[http://www.youtube.com/watch?v=dHI6Ciiy1V0 here]]. And [[http://www.youtube.com/watch?feature=player_embedded&v=I31QP4SE3Gw here]] is the first PV

Not to be confused with ''Music/KnightsOfCydonia'' by ''Music/{{Muse}}''.


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!! This Manga contains the following tropes:
* TheAce: Tanikaze is the Sidonia's first ace in living memory, the only one who has survived long enough to get that title. [[spoiler:As was his "grandfather"]].
* AlasPoorVillain: [[spoiler:Kunato]] really didn't deserve [[spoiler:getting bodyjacked by Ochiai]]
** The Gauna [[spoiler:Humanoid placenta. It's outright stated that it remembers the human it is based on, including it's attraction to Tanikaze]].
* ApocalypseHow: The Earth was cut in half, and humanity's desperate flight to the stars is almost Class 3. Sidonia may be the last refuge of Humanity, because contact with the other ships has been gone for almost 800 years.
** Sidonia itself lost more than 90% of it's population in the relatively recent past. The vast majority of the ship's current population are descended from artificial genetic templates or are clones of the survivors, [[spoiler:including the protagonist]].
* AGodAmI: Professor Ochiai.
* {{BFG}}: [[spoiler: The magnetic linear accelerator rifles that fire the Gauna-piercing bullets]].
** The Heavy-Mass cannon would be considered one, even if tiny compared to the Sidonia ship, it still fires projectiles the size of a building dwarfing a group of Guardians.
* BigEater: Tanikaze, on account of being unable to photosynthesize like most of the "humans" on Sidonia.
** Downplayed. He doesn't really eat any more than we do. At one point, he turns down a truly massive fish because "I don't eat that much." It's just the genetically engineered humans who make up the rest of the crew who eat very little.
* BlackBox: The Kabizashi blades are the only thing that can kill the Gauna, but no one knows how they work or how to make new ones, [[spoiler:at first]].
* BodyHorror: The fate of those who are captured by the Gauna. [[spoiler: Hoshijiro finds this out first hand, and the Gauna use a corrupted parody of her form as a placenta for a Guardian Shaped Gauna]].
* CharClone: The Red Sphingidae, Benisuzume.
* ClonesArePeopleToo: The Honoka sisters. Each of them has their own name (Honoka En, Honoka Hou, etc), and seem to be treated as individuals.
** This is also an important part of [[spoiler:Tanikaze's backstory. He was originally grown in a vat as a replacement body for the aging war hero Hiroki Saito, but Saito wanted to die a natural death and believed that his clone should be allowed to live his own life and so he absconded with the baby clone and raised him in seclusion as his own.]]
* CreatorProvincialism: Many countries built their own ships but the Japanese ship, Sidonia, is the only one we see as the rest have either been eaten by Gaunas or gone off in different directions and are too far to communicate with.
* EarthThatWas: Earth was lost to the Gauna a long time ago, in what may or may not have been the events of Nihei's earlier manga ''Abara''.
* EldritchAbomination: The Gauna are massive, fetus-like creatures with the ability to assimilate humans and technology with their CombatTentacles. Some Gauna creations resemble things that are assimilated, including a Guardian [[spoiler:and its pilot]].
* EndangeredSpecies: The Sidonia's inhabitants are probably the last humans remaining in the galaxy.
* EverythingsWorseWithBears: Lala, a human in the body of a bear, is Tanikaze's dorm mother for quite a while.
** PlayedForLaughs: She's actually very caring towards Tanikaze except when she's in a bad mood.
* ForMassiveDamage: The only weak point on the Gauna is their core, or "True Body", which when sufficiently damaged cause them to explode. Most engagements boil down to the Guardians desperately trying to chip through the Gauna's nigh invulnerable regenerating armor to reach the weakpoint.
* GenerationShip: The eponymous ship. There were others, but contact with them was lost.
* GrandTheftMe: [[spoiler:Professor Ochiai to Kunato]].
* HealingFactor: Tanikaze has one as a result of being [[spoiler:an immortal enhanced clone.]]
** The Gauna have a rather ridiculous one, making fights with them a race against the clock to get to the weakpoint before they regenerate.
* {{Hermaphrodite}}: Shinatose Izana. Unlike RealLife intersexed humans, s/he can have children with a man or woman thanks to being genetically engineered.
** EverybodyWantsTheHermaphrodite: Heartbreakingly averted. Izana loves Tanikaze deeply but he only likes women.
*** [[spoiler:Which leads to Izana eventually transforming into a female]].
* HumanoidAbomination: The Gauna, for the most part, but they take less humanoid forms in later encounters.
* HumongousMecha: The Guardians are Sidonia's first line of defense against the Gauna.
* {{Immortality}}: The captain and other members of the crew deemed essential to Sidonia's mission are kept alive indefinitely with biotechnology but because of limited resources the rest of the population is allowed to age and die at a normal rate. The truth about the Immortal Ship Committee is kept from them to keep them from getting jealous.
* InertialDampening: The Sidonia doesn't appear to have it. When they have to make sudden evasive maneuvers, massive internal damage results and people die, even though they used an EmergencyBroadcast to warn people.
* JerkAss: Kunato. And just when he seems to be getting better [[spoiler:his body gets hijacked by Professor Ochiai, who is not only more arrogant by at least a factor of ten, but a maniac with a god-complex.]]
* ManInWhite: Most of the Guardian pilots have white flight suits. [[WhiteShirtOfDeath Considering their survival rate...]]
* MaskPower: The captain wears a mask to prevent people from noticing that she doesn't age.
* MirrorMatch: The Guardians versus Benisuzume, [[spoiler:a replica of a Guardian eaten by the Gauna]].
* MohsScaleOfScienceFictionHardness: A solid 4, at least for the humans.
* NoSocialSkills: Not only is Nagate awkward due to living his whole life with only one man for company, what few social skills he ''does'' have appear to outdated and old-fashioned.
* OrganicTechnology: [[spoiler:The Chimerae, biomechs grown from Gauna and human cells by Ochiai as a replacement for the Guardians]].
* PhlebotinumDuJour: The Guardians are powered by Higgs Bosons.
* RealRobot: The Guardians count as this. Their spindly frames can't even stand up in gravity (with the exception of the [[SuperPrototype Type 19]]).
* RocketPunch: The Guardians can launch their hands off on a towline and grapple onto things with them. Tanikaze manages to weaponize this to defeat the Red Sphingida after it destroys his gun by taking a Gauna-piercing bullet between his fingers and launching it through her body at point blank range.
* SceneryPorn: It's a TsutomuNihei manga. It's his trademark. In fact, chapters often start with travel-guide style images titled "Sidonia's 100 Sights" that show off the scenery.
* SpiritualSuccessor: The series had an early prototype in the form of an obscure one-shot manga called ''Winged Armor Suzumega, [[EitherOrTitle or]] The Armored Insects Sphingidae''.
* StarfishAlien: The Gauna are a weird sort of fetus-like creature with a central "main body".
* StealthSequel: To ''Abara'', possibly.
* SuperPrototype: Due to being TheAce, Tanikaze gets first run of the Type 18 and (eventually) Type 19 Guardians.
* TaughtByExperience: Part of the reason the government values Tanikaze so much is because of his huge aptitude for piloting Guardians. And the reason for ''that'' seems to be because he had literally nothing to do but log hours into a Guardian simulator and take lessons from his only companion/parent, a former pilot himself. [[spoiler: The other part is that said "parent" was an incredibly renowned war hero.]]
* TranshumanTreachery: The monstrous-looking, heavily modified cyborg Professor Ochiai nearly destroyed Sidonia due to his attempts to create a Gauna/human hybrid. On the other hand, this being a Tsutomu Nihei manga, almost every member of the cast are genetically and/or cybernetically modified in some way themselves.
* TheUriahGambit: The captain wants Tanikaze dead for reasons not immediately explained and to this end orders him to fly in every single mission against the Gaunas in the hope that they'll eventually kill him. [[spoiler: This backfires as not only Nagate always survives but he eventually becomes Sidonia's greatest hero]].
* UsedFuture: The residential area of Sidonia is filled with dilapidated buildings and massive amounts of old piping. Much of the clothing the characters wear is patched up.
* WhiteShirtOfDeath: The pilot uniforms are all white, as are the Guardians themselves. Considering the attrition rate versus the Gauna...
* WhoWantsToLiveForever: Hiroki Saito was offered a chance at immortality but didn't take it too well.
* YouGottaHaveBlueHair: Yuhata has green hair and Honoka sisters have pink.
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