->''There raise not the dead.''
->''There cannot recover lost things, never again.''
->''Even the greatest miracle can only affect the living--''
-->-- '''OpeningNarration'''

Once upon a time, [[Franchise/{{Nasuverse}} Kinoko Nasu]] thought of a story where various legendary figures were summoned by wizards and [[UltimateShowdownOfUltimateDestiny made to fight each other]] for the Holy Grail. That story would eventually become ''VisualNovel/FateStayNight'', following the protagonists Shirou Emiya and the female knight Saber....

[[WellThisIsNotThatTrope But]] [[WhatCouldHaveBeen before that]] there was ''this'' story, where the protagonists were [[GenderFlip Ayaka Sajyou and the male knight Saber]].

''Fate/Prototype'' is a twelve-minute {{OVA}} released with Season 3 of ''Anime/CarnivalPhantasm'', acting as a digest version of the original concept of ''Fate/stay night''. It also encompasses a number of [[AllThereInTheManual material books and the like]], including character designs and story excerpts. The basic idea is the same as ''Fate/stay night'', but the difference is in the details.

Four characters (Ayaka, Saber, Lancer, and Archer) appeared in the Hanafuda game in the [=PSVITA=] port of ''VisualNovel/FateStayNight Realta Nua'', with their own scenario.

A Special Drama CD for ''Fate/Prototype'' was released on November 10, 2012. Another Special Drama CD was released in September, where Saber of ''Fate/Prototype'' being a guest star along with [[VisualNovel/FateStayNight Blue Saber]] and [[VideoGame/FateExtra Red Saber]].

In March 2013 at the Anime Contents Expo Type-Moon released ''Fate/Prototype -Animation Material-'', an artbook that contained storyboard illustrations of ''Fate/Prototype'' and scenes that weren't aired in the trailer.

A LightNovel series, titled ''Fate/Prototype: Fragments of Sky Silver'', began serialization in Comptiq magazine starting in August 2013, with Volume 1 released in September 2014, Volume 2 released in October 2014, Volume 3 released in March 2015, Volume 4 released in March 2016, and Volume 5 released in April 2017. The series is written by [[VisualNovel/SekienNoInganock Hikaru]] [[VisualNovel/ShikkokuNoSharnoth Sakurai]] and illustrated by Nakahara. The story is about the First Holy Grail War that occurred in Ayaka's childhood, essentially making it ''Prototype'''s answer to ''LightNovel/FateZero''.

Sakurai has also written a spin-off called ''Fate/Labyrinth'', where Manaka Sajyou spirit hops into an alternate universe and ends up possessing a female magus named Norma Goodfellow, who herself is a participant of a ''Sub-Category Holy Grail War'' where she has summoned [[VisualNovel/FateStayNight Artoria Pendragon]] as her Servant.

In October 2017, Type-Moon released the first drama cd in a Drama CD series titled "Fate/Prototype Fragments of Sky Silver", which covers the entirety of the events in the ''Fate/Prototype: Fragments of Sky Silver'' novels, but in a linear chronicle fashion.

'''This article will contain unmarked spoilers for ''Fate/Prototype'' and ''Fate/stay night'''''.
!!Tropes include:

* AllMythsAreTrue: Beings such as KingArthur, [[Literature/TheEpicOfGilgamesh Gilgamesh]], [[Myth/ClassicalMythology Perseus and Heracles]], [[Myth/CelticMythology Cu Chulainn]] are all summoned in the modern day for an UltimateShowdownOfUltimateDestiny. And with [[Literature/TheBible the Beast of Revelation]] being the ultimate threat to everything in the setting.
** The prequel also introduces the likes of [[UsefulNotes/PersianMythology Arash]], [[Literature/TheSagaOfTheVolsungs Brynhildr]], [[LegacyCharacter one of the nineteen]] [[UsefulNotes/TheHashshashin Hassan-I-Sabbah]], [[UsefulNotes/RamsesII Ramesses II/Ozymandias]], and even [[Literature/TheStrangeCaseOfDrJekyllAndMrHyde Dr. Jekyll and Mr. Hyde]].
* AllThereInTheManual: Long before the OVA, Ayaka and the male Saber were introduced in a ''TYPE-MOON'' art book called "Character Material". ''Prototype'' itself came with an art book of it's own, further expanding on the characters and story.
* AncientConspiracy: The Holy Grail War. Though in comparison to the FSN timeline, the Grail War is relatively new in the Protoverse.
* ArtifactOfDoom: The Grail granting wishes making it inherently evil is due to the wishes and desires of most humans [[HumansAreTheRealMonsters are typically selfish and not noble]]. This is partly due to the idea the Grail can grant wishes is based on the Celtic myth of Dagda's Cauldron, the Dundry, which eventually got equated with the Holy Grail due to the miracles it performs. Most people don't realize it's true nature due to no one ever using one before to grant a wish.
* BlingOfWar: Most of the Servants' armor is rather ornate. Archer's is even entirely gold plated.
* TheCallKnowsWhereYouLive: Ayaka Sajyou was told by her father before his death that she had no choice but to participate in the war herself, when the time came--but she wanted nothing to do with it, traumatized over the loss of her father and sister. Too bad the war came to ''her'', in the form of Lancer and a pack of hunting dogs.
* ChristmasEpisode: In the Special Drama CD, Ayaka spends her Christmas after the Holy Grail War on a cruise with Saber, Lancer, Archer and her AxCrazy sister Manaka... [[WalkingDisasterArea and then gets caught up in a murder mystery]].
%%* CrapsackWorld
* CrossoverCosmology: Figures from legend and prophecy around the globe coexist here. Of course, [[UltimateShowdownOfUltimateDestiny not for long]].
* EarlyInstallmentWeirdness: As one might expect, especially since it wasn't originally published or shown to the public. Examples include:
** Rather than Fuyuki (or Kobe with the serial numbers filed off, if you prefer), the setting for the Grail War is explicitly Tokyo. In the published ''F/SN'', the relocation seems to be, from a plot perspective, to make it easier to justify such a potentially destructive war being accepted by the Mage's Association, as they would ''freak out'' at the amount of destruction Tokyo suffers in the OVA.
** The Einzberns, or anyone with a role remotely similar, are ''nowhere'' to be found in ''Prototype''; the Grail instead was put together by a group of magi that likely included the Sajyou among them.
** The Grail War is a recent idea in ''Prototype'', with the one in ''Fragments'' being the first. In ''F/SN'' as published, the wars have been fought since the 1800s.
** Relatedly, there is no mention of the need for a sixty-year period between Grail Wars; the second Grail War of ''Proto'' starts eight years after the first, and this seems to be all the time usually necessary to restart a Grail War (and on top of this, it seems like the intent was simply for there to ''be'' one single HGW and the second one of ''Proto'' itself is relatively unplanned-for).
** The Noble Phantasms are ''significantly'' more destructive at full power than in ''F/SN'' as published, or indeed other ''Fate'' works. Arthur's Excalibur, for example, can devastate a good bit of the Tokyo metro area in just one swing.
*** Especially notable on this front is Proto-Gilgamesh's true NP, Enki: Sword of the End - which replicates the Flood of Utnapishtim, covering the world in water. Small wonder that it wasn't kept considering that it be pretty hard to hide a secret war when one of the participants floods the city and the other takes out said flood with one incredibly powerful blast of energy. [[note]]''Fate/Grand Order'', in particular, would later go on to explicitly state that ''no'' Noble Phantasm from a normal Servant has the power to destroy the entire planet completely due to the World's interference (although a few singularities of ''Epic of Remnant'' are devoted to either getting around this little restriction via the creative use of metaphysics or discussing parts of the multiverse where it isn't as true because they've ''already'' been pruned). And even if one did, attempting to invoke it would likely kill the user (and his/her Master if they have one) stone dead before it could fire unless they have a viable source of mana. Said [=NPs=] capable of planetary destruction are also classified as ''Anti-Planet/Anti-Star'' (depending on the translation) rather than "Anti-World". Which makes sense to a degree thanks to the differing connotations that the word ''world'' can imply.[[/note]]
** In ''Proto'', the Grails exist specifically to bring the Beasts into being. While it can also grant wishes, the Beast is part and parcel of the package as most wishes are born from selfish desires. In ''F/SN'', the Grail is simply an elaborate ritual tool for the invocation of the Third True Magic, which allows the soul to be materialized - basically, immortality without a physical body. The ''F/SN'' Grail does have a malevolent entity associated with it, but this was the result of a ''mistake'', rather than any kind of deliberate intent, and its presence prevents the Grail from operating as intended.
** On a more minor note, in ''F/SN'' and later ''Fate'' works, Command Seals almost always appear on the back of a Master's hand, with exceptions often requiring intent and planning to facilitate (such as Ilya's case). In ''Proto'', their place of appearance tends to be a lot more varied, with the Sajyous having theirs on their chests, Misaya having hers on her back between her neck and shoulders, one of the unnamed Masters having theirs below the left eye, Isemi having it on his palm, and Sancraid having his on his ''tongue''.
*** Speaking of Command Seals, the Master of Rider, Isemi, uses his Command Seal to supposedly incarnate Perseus (as in, give him a physical form) before his death. In the main ''Fate'' verse, there's no real indication that Command Seals would be capable of performing such an extraordinary feat - that kind of miracle is usually the domain of a Grail wish itself.
*** Also on the subject of Command Seals, in main ''Fate'' works, every Master in a Grail War gets exactly three Seals of equal power, with any difference in power between Masters purely down to who you manage to summon and one's own skill as a magus and a strategist. In ''Proto'', there seems to be a hierarchy of power among Masters, themed after the angelic hierarchy found in Christian apocrypha, especially ''[[https://en.wikipedia.org/wiki/Summa_Theologica Summa Theologica]]'', starting at "Princes" and going up to "Seraphim", gaining more "wings" as you go. Exactly how it works has never been elaborated on, however.
* TheEndOfTheWorldAsWeKnowIt: If the Grail ritual is completed, [[spoiler:the ''Literature/BookOfRevelation'' happens]].
* {{Expy}}: Inverted. ''Prototype'''s characters aren't based on the ''Fate/stay night'' cast, the ''Fate/stay night'' cast is based on ''them''. Precise examples of who propagated who can be found on the character page.
* EyesDoNotBelongThere: Some of the [[PowerTattoo command seals]] feature angel wings with eyes on them.
* FeatherMotif: Ayaka and crow feathers.
* FunctionalMagic: Laid the framework for the magic system in the Nasuverse, though a number of concepts turned out differently from here.
* GoodWingsEvilWings: The command seals are all based on angel wing motifs. About half of them still manage to look malevolent and creepy despite this.
* GenderFlip:
** Inverted. Shirou Emiya of ''Fate/stay night'' is a gender flip of ''Prototype'''s protagonist Ayaka Sajyou (although Ayaka also has a ''lot'' in common with Rin Tohsaka). Same goes with Saber, since she is also a gender flip of Ayaka's Saber-class Servant [[spoiler:and by extension, also a gender flip of KingArthur]].
** Played straight with Merlin, who is made a woman to contrast Arthur as revealed in the prequel.
* GratuitousEnglish: In true Nasu tradition, the text in the OpeningNarration is strangely worded. They also come with Japanese subtitles.
* HotSpringsEpisode: In the Hanafuda Minigame included in the [=PSVITA=] port of ''VisualNovel/FateStayNight Realta Nua'', Ayaka and her team get this ending in their scenario.
* KillSat: Archer summons a mystical one at the end of the original trailer--it's his [[ReadingsAreOffTheScale EX]] ranked Noble Phantasm, Enki: Sword of the End, which summons the Surge of Utnapishtim. It's capable of flooding the entire planet.
* PowerTattoo: The command seals (or as they're called here, Master Degrees).
** Also, the prototype Gates of Babylon, Bab-ilu: Key of the King's Law, which in this is a tattoo on Archer's face.
* {{Prequel}}: ''Fragments of Sky Silver'' is this. Well, maybe. Given that ''Prototype'' is just a RealTrailerFakeMovie with some AllThereInTheManual material and {{Drama CD}}s, one could say that it's the actual beginning of the story.
* RealTrailerFakeMovie: What the extant OVA amounts to. It's more or less a teaser for a story that's never been released in full.
* StormOfBlades: Just like his ''Fate/stay night'' counterpart, Gilgamesh has a Noble Phantasm capable of this called Bab-ilu: Key of the King's Law. However, it's a tattoo on his face, and it fires weapons out of ten small portals that form a circle around him not unlike a gatling gun, rather than as a gigantic downpour.
* TheStinger: Manaka Sajyou laughing in a massive pile of bones.
* TearsOfBlood: Rider after killing everyone in the hospital.
* ThemeNaming: The seven masters are given Master Degrees based on the angelic hierarchy: Princes, Powers, Virtues, Dominions, Thrones, Cherubim, Seraphim. The exception is Sancraid Phahn, who is given the title of Absence (or Void)--he is actually an anomalous eighth master in the War.
* UltimateShowdownOfUltimateDestiny: Eight all-stars of legend enter. Only one gets to leave.
* UnwittingInstigatorOfDoom: The priest who stole the Grail in ''Fragments'' for the Holy Grail War did it under the mistaken belief it would summon a divine and holy being upon granting the wish.
* UrbanFantasy: Just like with ''VisualNovel/FateStayNight,'' all the magic shenanigans take place in modern Japan - specifically, the greater Tokyo area, making it even more urban.
* {{Yandere}}: A flashback in ''Fragments'' reveals that Proto-Mordred was apparently even more ''extremely'' obsessed over Arthur than [[LightNovel/FateApocrypha the Mordred of Artoria's timeline]]. To the point ''they''[[note]]Proto-Mordred's gender hasn't actually been revealed yet.[[/note]] wanted to destroy everything Arthur cared about until he only had Mordred to focus his attention on.