[[quoteright:304:http://static.tvtropes.org/pmwiki/pub/images/undernight_poster_thumb_5939.jpg]]
[[caption-width-right:306: "Neither you or I, can return to the real world as we know it..."]]
-->Thousand night, Recurrence night, Reverie and Invite.\\
and...[[=7days=] Immortal] Unreal BLACK THINGS.\\
The deep darkness of the hollow night. New shells of incarnation alight.\\
One swing of a sword. Sinuous white snake. Savage fangs of the beast.\\
Tonight, the deepest night. Blessing for all who confronts...

In the quiet town of Kanzakai, a rumour stirs among the residents:

"Those who get their souls devoured by the Dark Shadows, will end up wandering eternally in a mysterious world."

They say that every full moon, a strange, alternate world merges with ours and mysterious monsters roam throughout the streets, killing and devouring all that they see. No one knows for sure as to whether it is real or not, but for the most part, it all seems like hokey.

[[BlatantLies Right?]]

[[TheHero Hyde Kido]] is an OrdinaryHighSchoolStudent, he has an ordinary life, ordinary friends and goes to an ordinary school, and he likes it that way. One day, he has a rather eventful encounter with a strange girl named Linne and they separate on that night after he shows her around the city. The next day, as Hyde is walking home after school, Hyde is beset upon by the rumored man-eating shadows and chased into an alleyway. Unable to move and do anything against his formless attackers, Hyde is narrowly saved by Linne who leaps in to fight the shadows off. However, Hyde is bitten by the creatures and slays the last shadow on his own when he is able to manifest a strange power. Linne helps Hyde up and the true stage of the city he once thought knew is revealed to him.

Those who survive their encounter with Voids become known as In-births, and the city of Kanzakai has been recently recognized as the most concentrated location of in-birth activity. In-births are able to utilize a power known as EXS, the energy source present in all living things. The particular nights where in-births and voids roam the streets are known as Hollow Nights and entire organizations have risen and fallen in their attempts to rule with their powers or keep wanton uses of powers in check. The longest lasting organization that currently holds the most authority over the night is Licht Kreis, an international policing force under the day-time guise of a benevolent charity enterprise. Linne formerly was associated with the now disbanded Night Blade clan who previously fought against Licht Kreis but in-fighting has led to their disbandment. Kanzakai itself however houses another prolific organization of in-births that has recently gained the attention of Licht Kreis' eye, the group known as Amnesia, led by a woman who seeks to ascend to a higher state of being, surpassing that of an in-birth: a Re-Birth. Caught in the middle of conflicting organizations and other numerous outliers in the city streets, Hyde finds himself caught in the middle of the mess, allied only with Linne and her companion Waldstein and meeting familiar faces he thought he knew and new ones to fight.

''Under Night In-Birth'' is a UsefulNotes/{{H|ighDefinition}}D 2D FightingGame made by French Bread, the makers of CultClassic, ''Videogame/MeltyBlood''. It combines fast paced, flashy combat with a unique Tug of War mechanic which rewards good defence. As of now, the roster includes twenty characters, with a couple of [[GuestFighter guest characters]] thrown in for good measure.

Originally released on September 20, 2012 in arcades. It later received two major updates titled ''Under Night In-Birth Exe:Late'', released on September 9th 2013, and ''Under Night In-Birth Exe:Late[st]'', released on July 23, 2015. Both revisions served to rebalance the roster, updated graphics, and added several new characters, which can be read about on the game's character sheet. A UsefulNotes/PlayStation3 port of "Exe:Late" was released on July 24, 2014, and [[http://shoryuken.com/2014/07/04/aksys-games-bringing-under-night-in-birth-exelate-to-north-america-in-2015/ would eventually be localized in 2015]] in North Amercia, with Europe getting the game a few days later. It was later released, in it's Exe:Late form, on Steam on June 12, 2016. "Exe:Late[st]" also received a console port on UsefulNotes/Playstation3, UsefulNotes/Playstation4, and UsefulNotes/PlaystationVita consoles, it was released in Japan on July 20, 2017. "Exe:Late[st]" was released on February 9th, 2018 in both NA and EU regions and localized by both Aksys/P-Qube respectively.

''Under Night'' also appears in the MassiveMultiplayerCrossover ''VideoGame/BlazBlueCrossTagBattle'', opposite ''Franchise/BlazBlue'', ''VideoGame/Persona4Arena'' and ''WebAnimation/{{RWBY}}''.

----
!!1st Clause. DIVIDE.
* AlwaysNight: Caused by the Hollow Night phenomenon where all the fighting takes place in the dead of night.
* AmbidextrousSprite: Hilda provides an aversion where her dress and eye colors will show the correct one regardless of which way she is facing. This applies to every other character who switch their primary hand when facing the opposite direction.
* BackgroundMagicField: The Hollow Night is permeated with EXS which allows the super-powered fighting to take place in the first place. It also passively acts as an advanced healing field that lets the characters to simply be knocked out when the fight is over, they'll be back on their feet in a short while.
* BadassLongcoat: Gordeau's purple duster, and Seth's black trenchcoat.
* BattleIntro: While unique battle lines were slim, more characters being added has led to more unique opening lines.
* {{BFS}}: Yuzuriha and Hyde wield ''very'' long katanas. Likewise, Gordeau uses an ''[[UpToEleven even longer]]'' SinisterScythe, and Nanase wields a broadsword as long as she is tall
* BigBad: Hilda at first glance, who is really just a pawn beneath Kuon.
* {{Bishounen}}: Hyde and Seth to name a few.
* BloodKnight: Carmine as a literal example. Waldstein and Enkidu also are known to enjoy having a good fight.
* BloodyMurder: Carmine utilizes his own blood to fight.
* CallingYourAttacks: A fighting game staple.
* CastFromHitPoints Carmine utilizes a special ability called Dissolve that forms a pool of blood that can be activated from across the screen with his specials. This prominent space control is balanced through Dissolve pools costing HP to utilize.
* CastingAShadow: Both Hyde and Seth. Gordeau also has a few darkness-like attacks.
* ChargedAttack: The Increase System has certain moves be held down for a few extra frames to gain more damage and have additional effects than their regular variants.
* ClothingCombat: Yuzuriha has her kimono involved in her at least three of her attacks.
* CoatCape: Yuzuriha, with a kimono.
* CombatStilettos: A majority of the female cast fight with these on.
* ComboBreaker: [[SuperMode Veil Off]]. Somewhat subverted in that it's not usable while getting hit, unlike other fighting games with combo breakers.
* ComebackMechanic: {{Inverted|Trope}}. [[StatusBuff Grind Vorpal]] gives whoever's got the better offense and defense a 10% damage boost once every 17 seconds and can sacrifice this buff for a ''Franchise/BlazBlue''-like LagCancel, sometimes leading to an UnstableEquilibrium.
* CoolSword: Hyde, Orie and Yuzuriha have one.
* CrissCrossAttack: Seth does multiple in his specials and Infinite Worths.
* CrypticBackgroundReference: Up until [st]'s Chronicle Mode, the entire plot of the games in the original release and in EXE: Late was accessible through the Arcade Mode story-line and its supreme lack of context had many people to think that they must have missed something.
* DashAttack: All characters have a special running attack.
* DarkIsNotEvil: Despite his appearance, attitude, and job as an Assassin, Seth is the game's AntiHero. Gordeau's coloration and weapon choice might also suggest this but he's arguably one of the nicest guys in the cast. Hyde himself utilizes darkness in combat but is also an extremely generous person.
* DoubleJump: A technique only shared by Linne, Akatsuki, and Eltnum. Nanase, and by extension Orie, can also achieve this through their Force Function.
* EldritchAbomination: Voids are akin to extra-dimensional creatures that are invisible to the naked eye and slip into the real world during nights where EXS is concentrated in. While not normally perceptible, the people who can see them and encounter them are driven to insanity and consumed. Only those who are lucky enough to survive their encounter have the chance to become an in-birth.
** Voids come in all shapes and sizes and they're manifested forms depending on the amount of EXS around them. At their lowest, they appear like dark blobs while in increasing order they appear more snake-like, feral quadrupedal beasts, and eventually humanoid in their absolute strongest.
* EveryoneWentToSchoolTogether: Around half the cast is composed of students in both middle-school and high-school. Hyde shares the same high-school with Orie, Seth, and Carmine while Phonon and Nanase share middle-schools. Byakuya and Tsukuyomi attend a different school and Erika attends an all-girls academy.
* FashionableAsymmetry: Seth and Hilda.
* FightingYourFriend: A small number of the cast are acquainted with each other but the unspoken rules of the Hollow Night will have them duke it out.
* GrappleMove: Throws are universal while characters like Waldstein, Carmine, Seth, Gordeau, and Mika have their unique command grabs.
* GenkiGirl: Yuzuriha, if the music notes that come out of her sprite during battle are any indication. Mika also counts.
* GratuitousEnglish: Just like [[Videogame/MeltyBlood its predecessor]], if not worse.
** Gordeau is, aside from the name and menus, the most notable example. GURIIMU REEPAAH! MORTARU SURAIDO!
** "FIRST CLAUSE! DIVIDE!"
** "DOWN! DEPLETION OF EXS!"
** "BREAKDOWN! VANISHMENT OF VOID!"
** Hyde goes for PunctuatedForEmphasis when doing his Vacant Shift special move: "FIRST! SECOND! THIRD!"
** Orie follows Hyde combined with CallingYourAttacks for her super named "REST! IN! PEACE!"
* GoingCommando: A common joke in the game regarding the female cast as a lot of the their animations and frames show no signs of underwear being worn. This is apparently completely intentional as the head of the development team decreed this as to not show visible panties in the game. Alternate Colors are however fair-game for certain characters.
* GuestFighter:
** ''Videogame/MeltyBlood''[='=]s Sion Eltnam Atlasia? [[spoiler: Technically, Eltnum is (more or less) Sion Eltnam Atlasia in an AlternateUniverse. She is subject to the same events as in Melty Blood, with most of Sion Eltnam Atlasia's back-story (and a massive design change). It should be noted that Eltnum is said to be intruding on the events of [=UNiB=].]]
** Played far straighter with [[VideoGame/AkatsukiBlitzkampf Akatsuki.]]
* {{Homage}}:
** Because of her existence, there are a few things from Eltnum that pay Homage to her ten years as a combatant in ''Melty Blood'', with her theme being the biggest one, [[BootstrappedTheme which is a remix of Blood Drain, Melty Blood Actress Again's title theme]]. [[spoiler: There is also the small fact that Eltnum [[LeaningOnTheFourthWall lives on the Forth Wall]] in story mode, having fought for ten years... she sees herself as viewing how the "next generation" stacks to herself. As such, she views her relationships with other characters as something of a SempaiKohai relationship, especially with Hyde. [[{{Cloudcuckoolander}} Just about everyone brushes her off as insane]]]]. And [[spoiler: She is finally free of that Goddamn [[{{Franchise/Nasuverse}} Shroom]] (read one: Kinoko Nasu) in her ending.]]
** Well, he is here... so you can't just summon the [[VideoGame/AkatsukiBlitzkampf Blitz motor user]] without some references to his struggle. [[BootstrappedTheme The theme that accompanies Akatsuki isn't his own, similar to Eltnum]]. War Start -Again- is a remix of title theme to Akatsuki Blitzkampf.
* HumanoidAbomination: Merkava. Most of the other Void probably qualify as well.
* IaijutsuPractitioner: Yuzuriha. With a {{BFS}} no less.
* IdleAnimation: Essentially the taunt move of the game. Since the Grind Grid System will react to movement in general, standing absolutely still not only yields a character saying some lines but can be interpreted as a taunt since they're not making use of the Tug of War at all.
* KatanasAreJustBetter: Yuzuriha's got one nice katana. Hyde's sword can be thought as one but it lacks a traditional hilt and scabbard.
* JigsawPuzzlePlot: Before Chronicle Mode, the story could only be pieced together through the separate Arcade Mode stories.
%%* KnifeNut: Seth and his weapon of choice.
* LadyOfWar: Orie is pretty much checking every list of requirements of this trope. Yuzuriha's fighting style is also pretty graceful, but she's more [[GenkiGirl energetic]] than most examples. Erika Wagner also contends.
* LagCancel: Particularly from the Reverse-Beat mechanic allowing the characters to utilize normals they haven't used in the combo strings. Starting off with a heavy attack can be made relatively safe by canceling back into a light attack.
* LaughingMad: From Carmine.
* LightEmUp: Orie and to a certain extent, Chaos.
%%* MightyGlacier: Waldstein
* MirrorSelf: A rather foreboding predicament to all who become in-births. [[NightmareFuel/UnderNightInbirth See this for more]].
* MultiColouredHair: Both Hyde and Seth. Hyde's is black and blond, while Seth's is black and white.
* NamedWeapons: Par for the course. Examples include Hyde's Insulator, Seth's Eliminators, Gordeau's Devour, and Orie's Ruler among many others.
* NamesToRunAwayFromReallyFast: Almost every character has some nickname out in the Hollow Night and is mostly identified with that nickname. Funny to consider that Hyde got his nickname just from a month of being active while Nanase earned hers in two weeks.
* NoblewomansLaugh: Hilda, of course.
* NoodleIncident: Hyde and Yuzuriha apparently had one and Hyde has been trying to get over it. Yuzuriha on the other hand doesn't seem to mind all that much but [st]'s Chronicle Mode shows that she's trying her best to forget it.
* OneHandedZweihander: How Gordeau wields his SinisterScythe.
%% * OneHitKill: They are called "Infinite Words EXS" (Pronounced "Exist").
* ParryingBullets: Waldstein's claws and Wagner's Shield can nullify projectiles if they make contact with them. Other haracters like Enkidu and Akatsuki have their parries.
* PhlebotinumOverload: What presumably turned Merkava into what he is. Gordeau and Chaos' friend Roger shared this fate.
* PunchedAcrossTheRoom: Wallbounces are plentiful.
* PowerDyesYourHair: Carmine's hair starts out white, but turns red when he activates his powers. An aesthetic choice from him to intimidate as many people as possible.
* PowerGlows: A character who is under the effects of Vorpal glows blue. Red if they're in Veil Off.
* RatedMForManly: Gordeau certainly looks the part, Enkidu more so.
* RazorWings: Vatista uses her wings to attack.
* RealMenCook: Character Q&As confirms that a majority of the male cast can cook. Hyde provides for not only himself but Linne, Waldstein, and Vatista while Gordeau is said to make a mean beef stroganoff.
* RedOniBlueOni: Hyde and Seth respectively. There's also the blue-haired [[LadyOfWar Orie]] and the redhead [[GenkiGirl Yuzuriha]]. Carmine and Gordeau also exhibit this trope in the former's Arcade Story.
* TheRival: Seth to Hyde, not unlike Creator/ArcSystemWorks other RedOniBlueOni rivalries ([[GuiltyGear Sol & Ky]] and [[Franchise/BlazBlue Ragna & Jin]]). Gordeau and Chaos are a friendly variant on this. Both sets of rivals have themes that play when they fight.
* ShockAndAwe: Akatsuki's Blitz Motor gives him this special property. It does make him very hungry very quickly though.
* SinisterScythe: Gordeau has this... [[HyperspaceArsenal notice that he's pulling it out of thin air]]
* SoulEating: What Gordeau's scythe can apparently do. Couple that with Gordeau's claws that rips out souls as he stabs them into you.
* SuperMode: Veil Off. Gives a 10% damage boost and doubles as a pseudo-ComboBreaker.
* SymbolicWings: Vatista's wings are arranged in such a way.
* {{The Gimmick}}: The character specific Force Function.
* TokenMiniMoe: Vatista, who is also an ElegantGothicLolita and a LittleMissBadass on top of that. Linne and Mika could also apply.
* WalkingShirtlessScene: Gordeau, who has a [[NoShirtLongJacket long jacket]] instead. Enkidu also wears half of his outfit and leaves his upper body completely bare.
* WordSaladTitle: The Japanese trend of [[RuleOfCool naming things weirdly because it sounds cool]] strikes with a VENGEANCE in this series.
* TheWorfEffect: In Orie's Arcade mode, [[spoiler:Merkava comes in out of nowhere after [[FinalBoss Hilda]] is defeated, and devours/kills her before fighting Orie himself.]]
* UnblockableAttack: Slightly averted. Seth is the only character that can make use of unblockable set-ups.
* ViolenceIsTheOnlyOption: One of the primary rules of the Hollow Night.
* WrestlerInAllOfUs: Waldstein, and to some degree Merkava. Mika busts in with some moves as well.
* YinYangBomb: Hilda and her outfit of choice.
* ZettaiRyouiki: Linne, Orie, Hilda, and Wagner.
----
'''BREAK DOWN'''\\
[-Vanishment of Void-]