The knife-edge is right here: Waver Velvet is plainly a living wound left behind by the Fourth Holy Grail War, yet The Case Files of Lord El-Melloi II refuses to place him directly on the main battlefield of the Fifth. It keeps him outside the door—at the point where the Clock Tower quota has already closed, key Holy Relics tied to the Fifth Holy Grail War have begun to move, and Fuyuki is on the verge of war. It is a perilous position. If written too lightly, it becomes nothing more than an “afterstory of the Fourth”; if written precisely, it becomes the most dangerous seam in the Fate timeline: in front are the people left behind by the Fourth, behind is the war situation of the Fifth already turning into motion, and Case Files deliberately leaves out the one person who least ought to have been excluded.
It is not “after the Fourth”; it is “outside the gate of the Fifth.”#
When many people bring up Case Files, their first reaction is still, “It’s about Waver grown up solving cases at the Clock Tower.” That is not wrong, but it undersells it.
In the currently available materials, the character page in Volume 1 already nails down the foundation: the identity of Lord El-Melloi II is itself an extension of the consequences of the Fourth Holy Grail War. He is not a new protagonist starting over apart from Fuyuki, but a direct result left behind by the Fourth. In other words, the protagonist of Case Files is not merely “a Lord,” but the person who survived the Fourth and was then forced by the Clock Tower to go on living.
More importantly, the final chapter of Volume 3, “The Twin Towers of Iselma (Part 2),” gives a hard temporal anchor: the Clock Tower quota for the Fifth Holy Grail War has already closed. This information looks like a mere note of timing, but it carries tremendous weight. It shows that Case Files is not drifting loosely somewhere between the Fourth and the Fifth, but has already drawn close to the Fifth—close enough that even the door to officially participating has already shut.
Then the prologue through Chapter 2 of Volume 4, “Rail Zeppelin: Grace Note (Part 1),” tightens the screw another turn: a certain Heroic Spirit relic, highly relevant to the Fifth Holy Grail War and of immense personal significance to Lord El-Melloi II, is stolen. The Fifth has not yet formally broken out within this work, but its outer edges are already moving first: quotas, relics, pursuit, probing—all of it has begun to turn.
So the precise position of Case Files is not “a story after the Fourth,” but “a story about a person left behind by the Fourth being shut out by the Fifth.”
The most gut-wrenching point: it is not that he does not want to go; it is that he cannot.#
What is truly cruel about this work is not that Waver still remembers the Fourth, but that he is not simply reminiscing. He truly wants to go back.
The final chapter of Volume 1, “Adra Castle of Separation,” already makes this explicit: Lord El-Melloi II once hoped that after his contract with Reines ended, he could participate in the Fifth Holy Grail War as an ordinary magus, solely to see again a certain “him” who meant the world to him. The materials add one more blow as well: this prayer, sustained for ten years, ultimately never reached the Far East. In other words, this was not a near miss—it failed completely.
At that point, the emotional center of Case Files changes.
If he had never thought about participating in the Fifth, then Case Files would merely be the later life of a survivor of the Fourth. If he wanted to go, yet failed to make it, then Case Files is about something else entirely: a person fixing the coordinates of his life between a war that has already ended and a war he failed to catch in time.
That line in the final chapter of Volume 3—“the quota has already closed”—is therefore far more than a time marker. It is a verdict. The door has shut. Even if he is still being dragged along by the Fourth, he has no way to return to Fuyuki as an official participant.
Chapter 2 of Volume 4 is even harsher. Olga-Marie’s side confirms that he had once applied for the Clock Tower quota for the Fifth Holy Grail War, and then uses that application record together with the stolen relic to infer his motives. In an instant, in the eyes of others, he is no longer merely “a teacher unrelated to the Holy Grail War,” but someone who failed to enter the Fifth and yet never truly left it behind.
This is where Case Files hurts the most: it writes “wanting to go but being unable to” as a continuing state, not a one-time failure.
Why call this the most dangerous seam in the Fate timeline?#
Because on the other side, the opening chain of the Fifth’s main story has already begun to move.
The order presented from the prologue of Fate/stay night through the early part of the Fate route is very clear: Rin Tohsaka first completes Archer’s summoning and enters preparation for battle; meanwhile, Shirou Emiya is still only an ordinary student at school; then come the nighttime stay at school, witnessing a Servant battle, Lancer’s attempt to silence him, Rin saving him with a jewel, Lancer pursuing him to the Emiya residence, Saber’s appearance, and finally the explanation at Kotomine Church of the Fifth Holy Grail War’s basic rules and participation constraints. By this point, the central axis of the Fifth is no longer a distant prospect, but a reality beginning to pull people in.
Set that chain against Case Files, and the danger becomes apparent.
On one side, in stay night, the Fifth War is forcibly dragging outsiders into the field. On the other side, in Case Files, Lord El-Melloi II is already so late that even the application window has closed, and can only be pulled in from the reverse direction through peripheral spaces such as the Clock Tower, the train, and the circulation of relics.
That is how it gets stuck in the most dangerous seam: it lies too close to the Fifth, close enough that you can hear the gears before the war begins; and yet it is too far from the Fifth’s main battlefield, far enough that the protagonist himself can only feel the war drawing near through quotas, records, and the movement of relics.
If this position were written even a little vaguely, the whole work would lose its footing. What allows Case Files to stand is not barging into the main Fuyuki narrative, but seizing on several especially hard boundaries: the quota closing is an institutional threshold; the relic theft is a pull from reality. These two boundaries lock Lord El-Melloi II in place together, giving the entire series a rare tension: the protagonist stands extremely close to the core event, yet is explicitly excluded from it.
That is more powerful than “he goes to participate in the Fifth.” Because once regret is written as a door that has already closed, it is no longer just an emotion, but a confirmed failure.
The Clock Tower is not a backdrop; it is the reality that traps him.#
Case Files has another aspect that is very easily underestimated: it does not “send” Waver from Fuyuki to the Clock Tower, but fixes the consequences the Fourth left him with into everyday life.
The character page in Volume 1 and related materials explain that Lord El-Melloi II’s position comes from the vacancy left behind by the collapse of the El-Melloi faction after the Fourth; Reines, too, is not a simple supporting character, but actively maneuvers around the El-Melloi family name and the seat of Lord. In other words, Waver did not naturally grow into being “a teacher”; he was pushed into it.
Without this layer, Case Files would become a story about a man endlessly longing for the past. With it, what it depicts is this: a person changed by the Fourth, before he has even had time to tend to his wounds, is already nailed into reality by a family name, duties, students, and cases.
So his inability to go to the Fifth is not merely “missing an opportunity”; it is also because he is no longer the boy from the Fourth who could charge ahead alongside Iskandar. Now he is a Lord, a lecturer, a man bound by his position. The stage shifting to the Clock Tower does not mean Fuyuki is unimportant; on the contrary, it is precisely because Fuyuki matters so much that he seems all the more trapped.
This is also where the train arc in Volume 4 draws its force. The relic theft is not an ordinary case prop; it presses the trauma left by the Fourth, the pressure of the approaching Fifth, and the Clock Tower’s internal judgment of him all onto the same starting point. The fact that Olga-Marie and others infer his motives from the application records and the relic itself shows that, in the world of magi, he is no longer “someone simply longing for the past,” but someone whose obsession itself will be analyzed and tested.
This is the adult Waver. It is not that it no longer hurts, but that he has to go on living even with the pain.
The value of Case Files lies in refusing to connect the Fourth and the Fifth directly.#
Its cleverest move is that it refuses to write the blank space between the two Holy Grail Wars as a corridor for convenient passage.
Many interstitial stories cannot resist paving the road for the main plot, treating the job as done once they send the characters to the next battlefield. But Case Files does not do that. It leaves Lord El-Melloi II outside the door, lets him know the Fifth is drawing near, makes clear that he really did apply, that he really did want to see that person again, that he really was stirred once more by the relic and the turmoil on the periphery—and then tells you plainly: he did not get in.
That single pause makes the entire Fate timeline stand upright at once.
The Fourth is no longer merely the prehistory of the Fifth, because it truly left behind a living person who continues to bear its consequences over the following ten years. The Fifth is no longer merely the story of the protagonists of stay night, because outside Fuyuki, someone has already been forced into motion by its quotas, relics, and preparatory tremors. And Case Files itself therefore ceases to be mere supplementary explanation, becoming instead a narrow path squeezed out by pressure from both sides.
That is why it is lodged in “the most dangerous seam”: too close to the core, and it risks being swallowed by the main story; not close enough to the core, and the slightest slackness would make it lose all weight. Yet in the end it stands precisely on this chain of evidence: “the identity-consequences left by the Fourth + the closing of the Fifth’s quota + the movement of a key relic + the unfulfilled wish to participate.”
To put it more harshly, what Case Files truly writes is not merely how Lord El-Melloi II solves cases, but how a survivor of the Fourth is explicitly told by the world, before the Fifth begins: you are already too late.
And he still has to keep moving forward.