The knife was never first drawn on the night the Fifth began.
It had already gone in ten years earlier.
When many people talk about the opening of Fate/stay night, they habitually fix the camera on the most obvious chain of events: Shirou witnesses the clash between Servants, is silenced by Lancer, Saber is summoned, and the war suddenly kicks into a higher gear. That chain is certainly exciting, but if you focus only on it, the Fifth Holy Grail War is easily mistaken for a completely fresh beginning.
The picture given by the existing text is actually colder. The Fifth did not begin out of thin air; it kept moving forward on the wounds, old rules, and unresolved human affairs left behind by the Fourth. If you really want to see that layer clearly, the place of The Case Files of Lord El-Melloi II is crucial: it is not some light postwar addendum, but something that illuminates the stretch so often skipped over—“after the Fourth, up until the preparations for the Fifth.”
What Case Files catches is not “postwar small talk,” but the outer edge of the Fifth’s opening.#
First, let’s make clear the parts we can pin down.
From the materials currently available, Lord El-Melloi II’s storyline had, at minimum, already extended beyond the end of the preparation stage for the Fifth Holy Grail War. This judgment is not based on atmosphere, but on several pieces of information that lock together.
First, the character page in volume one and the series settings tie Lord El-Melloi II directly to the consequences of the Fourth War. He is not merely a character who “went through the Fourth,” but someone whose entire life trajectory was rewritten by that war.
Second, the final chapter of volume three, The Twin Towers of Iselma (Part 2), already contains the information that “the Clock Tower quota for the Fifth Holy Grail War has closed,” and this is used directly to sting him. The meaning is clear: the Fifth is not some distant future; even registration has already ended.
Third, the opening part of volume four, Rail Zeppelin Grace Note (Part 1), pushes this relationship one step further: the text mentions that Lord El-Melloi II had once acted in regard to the Clock Tower quota for the Fifth Holy Grail War; at the same time, his boarding of the Rail Zeppelin is also connected to the theft of a Holy Relic related to the Fifth and of great significance to him. (To be verified: the stolen item and the wording in the specific chapters still need to be checked line by line.)
With that, the place of Case Files becomes clear. It is not a bit of side material about “everyone going on with their lives after the Fourth,” but about people left behind by the Fourth already being dragged back into reality by the Fifth’s quotas, preparations, and obsession with participation.
The blow in the final chapter of volume one, Adra Castle of Separation, is especially heavy. The text states that Lord El-Melloi II had once hoped that, after his contract with Reines ended, he could participate in the Fifth Holy Grail War as an ordinary magus, only to see again a certain “him” who was extremely important to him; and that this prayer, sustained for ten years, ultimately “did not reach the Far East.” If this quotation is accurate, its weight is brutal: what pulled at him was not some abstract “desire to join the Holy Grail War,” but a wish he had never let go of after his defeat in the Fourth, and in the end that wish still came to nothing. (To be verified: the exact wording of the original sentence and how its referent is phrased.)
So what Case Files truly fills in is not background explanation, but how pressure falls on actual people: how someone goes to fight for a slot, chases after a Holy Relic, and is left with a new wound for failing to reach Fuyuki.
Of course, the currently available materials are still insufficient to state precisely whether the main events of Rail Zeppelin Grace Note occur before or after the outbreak of the Fifth proper, so we cannot force that claim here. (To be verified.) But “at minimum, it has already advanced past the end of the Fifth’s preparation period” is a point that holds up.
The Fifth opens with one foot planted squarely on the ashes left by the Fourth.#
Now look again at the prologue of Fate/stay night.
What many people remember is Rin Tohsaka summoning Archer and beginning her reconnaissance of Fuyuki, but a more striking detail in the prologue is that Fuyuki is not a city that has already turned the page. As Rin patrols with Archer, the text notes that Shinto Park still bears the lingering grudges left by the final battle of the previous Holy Grail War and by the great fire. If this quotation has been identified correctly, then from the very beginning the Fifth’s preparations are not “surveying a new battlefield,” but confirming that the old battlefield’s wounds are still there.
That is deadly serious. Because before the war has even formally pulled all the main characters in, the marks left by the Fourth have already claimed the physical space first.
Then, from the prologue into the early Fate route, that aftershock is pressed all the way onto Shirou. Staying late at school one night, Shirou witnesses a clash between Servants and becomes a witness. Under the war’s rules of secrecy, he instantly changes from an ordinary student into someone who must be dealt with, so Lancer turns around and kills him. Rin notices that he still has a thread of life left, and uses the jewel left behind by her father to save him.
This point is crucial. Shirou does not exit the stage at school simply because “the protagonist has plot armor,” but because Rin used something her father left behind. In other words, even his first step in getting back up is planted on an inheritance from the previous generation.
And there is nothing romantic about it. Rin was already in a state of preparing for war at the time: Archer had already been summoned, and she had already begun scouting Fuyuki. That jewel was not an everyday item, but a resource tied to the Holy Grail War from the start. In the middle of war preparations, she used something left behind by the previous generation to drag back by force a person the rules had already marked for death.
How Shirou was drawn in: not because he “wanted to fight,” but because he was driven step by step until there was no way left to remain outside.#
If you straighten out the chain of events, things become clearer.
The rough sequence that can be stably reconstructed from the existing text is this: Rin first summons Archer and enters her preparation phase; Shirou is still in the routine of school and the Emiya household; while staying late at school one night, he witnesses a Servant battle; after discovering the witness, Lancer kills him; Rin revives him with the jewel left by her father; afterward Lancer continues pursuing him to the area around the Emiya residence, attempting to finish the silencing; Shirou is driven into a corner near the shed; Saber is summoned, blocks the fatal blow, and forms a Master-Servant contract with Shirou; afterward Shirou comes into contact with Rin and is taken to the Kotomine Church, where he receives an explanation of the Holy Grail War.
The harshest thing about this whole chain is not its speed, but how the position of the outsider is squeezed away step by step.
At the beginning, Shirou is just an ordinary student. He does not volunteer, does not prepare in advance, and has not even grasped the outline of the battlefield. But the moment he becomes a witness, the rules first mark him as someone who should die; after surviving, he is then nailed down as a participant because of the Command Spells and Saber’s summoning. There is almost no room here for “let me think about whether I want to join.”
Kotomine Kirei’s role at this point is not just to explain the setting. The Church’s explanation confirms at least two things: first, what is being held in Fuyuki is the Fifth Holy Grail War; second, Shirou has already formed a bond with a Servant through Command Spells and is no longer a bystander who can casually walk away. (To be verified: the exact wording and strength of the restriction regarding “being unable to withdraw.”) Many people treat this segment as beginner instruction, but what it really completes is a declaration of identity.
So the key to “the chain by which Shirou enters the game” is not whether he later gets fired up with heroic passion, but that at the start he did not walk into it of his own will at all. He was first hunted by the rules of the war, then revived by an old relic, then pinned onto the board by Saber and the Command Spells, and finally formally informed by the Church: you are no longer outside the field.
Why the Fifth keeps turning back to illuminate the Fourth: because the people were never severed, and neither was the Grail.#
If you look only at the opening, all of this can be understood as a sudden entanglement. But the middle of the Fate route states the issue more clearly: the reason the Fifth always reflects back onto the Fourth is not because the narrative is trying to seem profound, but because that war was never cleanly cut off in the first place.
Within this layer, there are at least several very hard lines.
One is Saber’s memory. She recounts the closing phase of the Fourth Holy Grail War ten years earlier, mentioning that Kiritsugu Emiya used a Command Spell to force her to destroy the Grail; connected to that, the Fuyuki Fire also ceases to be mere city background and becomes a leftover problem that must be questioned anew.
Another is the continuity of the ritual itself. Kotomine Kirei explains that the Fuyuki Holy Grail War is not a temporary event, but a ritual long constructed by the three founding families—the Einzberns, the Tohsakas, and the Matous; the Fifth is not a reset after cutting off previous events, but still turning within the same framework.
There is also the fact that Saber herself is not in the ordinary Servant state of being completely severed from the previous war. The currently available materials show that she did not participate by the usual route of “becoming a Heroic Spirit after death and then being summoned,” but instead made a contract with the World at the moment of death and was repeatedly summoned in pursuit of the Grail, thus entering the Fifth carrying memories of the previous war. (To be verified: the precise wording of this mechanism in the relevant text.)
Put these together, and the ominous feeling at the start of the Fifth is no mere atmospheric flourish, but a fact: the city still bears grudges left by the fire, the ritual is still the same ritual, the supervisor remains in the same old position, and even Saber has brought back the wounds of the previous war with her. A Fifth like that could never have been a fresh table.
And precisely because of that, Shirou’s entry into the game is even crueler. On the surface, he seems to have accidentally stumbled into a supernatural slaughter; in reality, he has stepped into a machine that never fully stopped ten years ago.
What truly rewrote the opening of the Fifth was not one person, but an entire set of unfinished things.#
So when the question asks, “How did the aftershocks of the Fourth War rewrite the opening of the Fifth,” the answer cannot stop at empty talk like “the previous one had an influence.”
What truly rewrote the opening was the whole set of unfinished states left behind by the Fourth.
Some unfinished things belong to people. Lord El-Melloi II always wanted to participate in the Fifth as an ordinary magus, just to see someone important again; in the end that wish never reached Fuyuki, yet it continued to pull his actions in Case Files. (To be verified: the corresponding original sentence.)
Some unfinished things belong to the city. Shinto Park still retains the grudges of the last final battle and the great fire; Fuyuki itself is still carrying the Fourth.
Some unfinished things belong to relics. Rin uses the jewel left by her father to save Shirou; what the previous generation left behind directly determines who gets to step alive into the Fifth.
Some unfinished things belong to the ritual. The Church’s explanation confirms that this is the Fifth; later, the line of the three founding families and the structure of the Grail is connected back in, showing that this is not a new game after a reset.
And there are unfinished things within the characters themselves. Saber does not begin her second round cleanly; she returns to the battlefield carrying the failure and memories of the Fourth’s closing phase. (To be verified: details of the wording.)
Only when these things are layered together do they form the “opening” of the Fifth. On the surface, it looks like a boy stumbling into a war at school; in its bones, it is full of consequences from a war ten years earlier that were never fully cleared away.
And the value of Case Files lies precisely in how clearly it illuminates this relationship: people who failed in the Fourth do not automatically fade into background scenery. They will fight for slots, miss their chances, chase after Holy Relics, and turn “failing to reach Fuyuki” into a wound that lasts for years afterward. Once you look back at the chain by which Shirou enters the game, it becomes very hard to see the Fifth as a brand-new match that began out of nowhere.