The snow on the outer courtyard terrace was thick, untrodden, and dry enough to squeak beneath the soles of small boots.
“Look, Papa!
It’s taller today!”
Illyasviel’s laugh was light, cutting clean through the frozen stillness of the mountain air.
She was bundled in a heavy crimson coat with white fur trimming her hood, her tiny hands encased in thick knit mittens as she patted another clump of packed snow onto the chest of a half-formed snow knight.
Her silver hair spilled out from her hood, bright against the blinding white of the courtyard.
Kiritsugu crouched in the drifts beside her, his dark trench coat dragging in the snow.
His leather-gloved hands worked carefully, carving the rough outline of a miniature sword from a frozen twig.
“A knight needs a proper blade, Illya,” Kiritsugu said gently.
His voice was soft, devoid of the flat, mechanical deadness he used with the homunculi.
“Otherwise, how is he going to guard the castle?”
“He doesn’t need a sword,” Illya said, looking up at him with wide, ruby-red eyes that held no malice, no knowledge of the world outside these walls.
“He just needs to stay here.
With us.”
Kiritsugu’s fingers paused against the wood.
The twig snapped silently in his grip.
He kept his face still, forcing a faint, gentle smile as he smoothed the broken edge with his thumb.
“Right,” he murmured.
“Of course.”
Behind them, the heavy oak doors leading to the courtyard creaked open.
Irisviel stood in the archway, wrapped in an ivory wool cloak.
She didn’t step out into the deep drift, but her soft crimson eyes rested on the two of them with a quiet, lingering warmth.
“It’s time, Kiritsugu,” Irisviel said softly.
Her voice barely carried across the snow, carrying an underlying weight that Illya was too young to catch.
“Lord Acht is waiting in the chapel.”
Illya’s smile faded slightly.
She grabbed Kiritsugu’s sleeve with a mitten, pulling weakly.
“Already?
But we haven’t finished the shield yet, Papa!”
Kiritsugu knelt lower, reaching out to gently push a stray strand of silver hair back beneath her hood.
He looked into her eyes, memorizing every line of her face, the warmth of her breath against the freezing air—anchoring the memory deep in his chest where the Einzberns couldn’t reach it.
‘I’m doing this for you,’ Kiritsugu thought, his chest tightening until it hurt to breathe.
‘So you never have to stand in that chapel.
So you never have to become what they made your mother.’
“Finish the knight while I’m gone,” Kiritsugu told her quietly.
“I’ll check on him when we get back.”
“Promise?”
“I promise.”
Kiritsugu stood up.
The warmth drained from his posture as he turned his back on his daughter, stepping across the terrace toward Irisviel.
As he crossed the threshold into the interior hallway, the massive double doors swung shut behind them, cutting off the sound of Illya’s laughter and locking the cold outer courtyard away.
The shift in atmosphere inside the inner keep was absolute.
No words were spoken.
The casual intimacy they shared in private dissolved instantly as they moved deeper into the castle’s spine.
Here, under the eyes of the bound homunculi standing motionless in the shadows, any demonstration of affection was a liability.
Irisviel fell back half a pace, lowering her head into the submissive posture expected of an Einzbern creation.
Kiritsugu’s jaw set, his shoulders squaring into the rigid posture of an assassin presenting himself to his employer.
They entered the chapel gallery.
The iron-shod doors closed behind them with a muffled, heavy thud.
Darkness inside the gallery clung to the high stone walls, held in place by the stagnant cold.
Frost feathered the corners of the flagstones, crunching faintly under Kiritsugu’s heavy leather boots.
The air bit at his nostrils with the taste of damp slate and ancient dust.
Beside him, Irisviel pulled her white fur-lined coat tighter around her throat, the thick fabric rustling in the quiet hall.
Her breath bloomed in short, pale clouds that vanished into the gloom.
She did not speak.
She didn’t look at him.
Kiritsugu flexed his fingers inside his leather gloves, feeling the slight pull of the seams over the back of his right hand where the Command Seals lay hidden under his sleeve—a faint, dull throb buried beneath the skin.
They crossed the vaulted gallery leading toward the main nave.
Kiritsugu lifted his head, his neck muscles straining as he looked up at the towering stained-glass windows overhead.
The colored glass depicted the wandering chronicle of the Einzbern bloodline in their pursuit of the Holy Grail.
Cold blue and faint crimson light filtered down through the glass, painting long, silent streaks across his dark coat.
‘A thousand years,’ Kiritsugu thought, staring at the figures trapped in glass.
‘A thousand years of chasing a ghost in the snow.’
They had shut themselves away within these mountains, severing every connection with the outside world.
For nearly ten centuries, they had searched for the miracle in absolute isolation.
Yet their record was nothing more than a loop of ruin and agony.
Failure yielded to recalculation, only for the new calculations to fail again.
‘And when they realized they couldn’t do it alone,’ Kiritsugu thought, ‘they had to drag in outside blood.’
Two hundred years ago, despairing of ever touching the Grail by their own hands, they had bowed their heads and struck an alliance with the Tohsaka and Matou families.
Yet even that compromise had failed.
In the wars that followed, Einzbern’s Masters had lagged fatally behind in combat capability, losing every single conflict.
That repeated humiliation had forced them into a second betrayal of their founding creed nine years ago.
‘And that’s where I come in,’ Kiritsugu thought.
A single, sharp glint of light struck the painted edge of a glass sword.
‘The dirty trick.
The assassin hired to do the bloody work their pure bloodline couldn’t manage.’
His gaze shifted toward a newer panel set near the high archway at the gallery’s end.
It depicted Justeaze Lizrich von Einzbern—the Winter Saint—flanked by the founding heads of Tohsaka and Matou.
Even in glass commissioned to record an alliance, the Einzbern artisans had rendered the foreign magi smaller, kneeling slightly lower, subordinates reaching up toward the saint’s radiant cup.
‘If I somehow survive this mess…’ Kiritsugu thought, a faint, bitter sneer touching his jawline.
‘…they’ll probably shove my face into one of these windows too.
Next to the saint.’
Irisviel’s hand brushed lightly against his sleeve—a fleeting, silent pressure that lasted less than a second before her arm fell back to her side.
It was the only signal she gave.
Kiritsugu nodded once without turning his head, stepping out from the shadow of the gallery arches and into the main nave toward the high altar.
At the base of the altar, the master of the winter castle stood waiting.
Jubstacheit von Einzbern.
Ever since inheriting the title of the eighth head of the family, he had been known simply as “Acht.” By repeatedly stretching his own life through homunculus alchemy, he had existed for nearly two centuries, pivoting the family from mere seekers into active combatants.
He had personally known Justeaze.
He had lived through the crushing defeats of the second and third wars.
That living memory of failure sat heavy in the old man’s rigid posture and unblinking stare.
‘Look at him,’ Kiritsugu thought, meeting the old man’s dead gaze.
‘Two hundred years of rotting in ice, and he’s still consumed by it.’
The old man gestured with a pale, bone-thin hand toward the stone altar.
Rested upon the altar was a heavy, blackened chest bound tightly with thick iron bands.
Its dark oak wood was dry and cracked with age, pitted where the iron had rusted into the surface.
A faint, bitter scent of dried pitch and old earth drifted from the relic.
“The relic retrieved from Cornwall arrived this morning,” Jubstacheit said.
His voice rasped like iron dragging over slate, echoing off the high stone vaults.
He stroked his long white beard, which hung down his chest like a frozen cascade, while his sunken eyes locked onto Kiritsugu.
“Using this as the catalyst, you will summon the strongest Servant—the Spirit of the Sword.
Consider this the absolute limit of what the Einzbern family can grant you.”
Kiritsugu stepped forward, his boots clicking once against the floor before he brought them together.
He lowered his posture, locking his spine rigid as he bowed his head deep.
Before speaking, his eyes darted over the iron bindings on the chest, taking in every detail—the size, the heavy iron latch, and the dark red circle of unbroken sealing wax stamped across the lock.
“I am unworthy of such generosity, Head of the Family,” Kiritsugu said.
‘Keep your face still,’ Kiritsugu told himself beneath the bow.
‘Don’t give him a single thing to read.’
Three years ago, the Command Seals had appeared on the back of Kiritsugu’s right hand, binding him to the family’s goal.
The Grail had raised no objections to the foreign blood.
Acht turned his yellowed eyes onto Irisviel.
His gaze slid over her face, scanning every feature as if checking the tolerances on an instrument.
“Irisviel.
What is the status of the vessel?”
Irisviel took a slight step forward, placing her hands neatly together over her white coat.
Her chin lifted under the old man’s gaze.
“There are no issues, Lord Acht,” she answered without hesitation, her voice crisp and clear in the frozen air.
“Even upon arriving in Fuyuki, its functions will operate at maximum capacity.”
Kiritsugu heard the subtle shift in her breath—a tiny, deliberate intake of air through her nose to steady her pulse under the old man’s lingering inspection.
She was marching into Fuyuki as a walking container bound for her own destruction, a living core crafted to absorb defeated Servants until her body collapsed—a reality Acht treated as simple logistics.
A wild light flared deep within Acht’s sunken sockets, making the dead yellow of his irises stand out in the gloom.
He nodded slowly.
“This time…
not a single one must remain,” the old man hissed, his voice trembling.
“Kill all six Servants.
This time, we will realize the Third Magic—Heaven’s Feel!”
The magus and the homunculus answered in unison, their voices striking the bare walls together and ringing off the high glass.
Kiritsugu kept his eyes fixed on the cold stone floor beneath his boots, watching the faint reflection of the window light on the dark flagstones.
‘Realize…’ Kiritsugu thought, listening to the echo of the old man’s voice fade into the high rafters.
‘That’s the only word he has left.’
‘A thousand years of chasing a lost divine miracle,’ Kiritsugu thought, watching a single dust mote drift through the blue light above the stone floor.
‘They don’t even care about the miracle anymore.
They just can’t stand the thought of losing.’
The heavy chapel doors clicked shut behind them, locking Jubstacheit’s rasping voice and two centuries of frozen ambition inside the dark nave.
Neither of them spoke as they traversed the vaulted corridors.
They walked side by side, their footfalls perfectly synchronized until the heavy stone arches gave way to the warmth of the castle’s living quarters.
The moment Kiritsugu turned the brass handle of their private suite and stepped across the threshold, the oppressive weight of the Einzbern family line seemed to slide off his shoulders—not vanishing, but settling into a familiar, quiet ache.
The room was dimly lit by a soft fire crackling in the stone hearth.
Heavy velvet drapes muffled the howling mountain wind outside, creating a small, fragile pocket of humanity within the fortress of ice.
Kiritsugu unbuttoned his dark trench coat and threw it over the back of a high-backed armchair.
He stood before the fire, extending his leather-gloved hands toward the flames before slowly peeling the leather away, exposing the dark crimson Command Seals etched into the skin of his right hand.
Behind him, the rustle of wool signaled Irisviel unfastening her coat.
She draped it neatly over a side table and walked over to stand beside him, her silver hair catching the flickering orange glow of the hearth.
For a long moment, the only sound was the popping of resin in the firewood.
“He didn’t look at you as a human, Kiritsugu,” Irisviel said softly.
Her voice lacked the crisp, formal cadence she had used in the chapel.
It was gentle, almost hesitant.
“He looks at you as a blade he bought.”
“That’s because that’s what I am to him,” Kiritsugu replied, his eyes fixed on the embers.
“A weapon with a price tag.
And as long as he believes that, he won’t look too closely at what we’re actually planning.”
Irisviel turned to look at him, her crimson eyes reflecting the warm light.
She reached out, her pale, warm fingers gently sliding over his right hand, covering the Command Seals.
“And me?” she asked quietly.
“To him, I am only the vessel.”
Kiritsugu’s hand flexed under hers.
He turned his palm upward, intertwining his fingers with hers, squeezing with a tight, desperate pressure that belied his usual stoicism.
“You’re Irisviel,” Kiritsugu said, his voice dropping to a low, gravelly rasp.
He looked down into her eyes, the words spoken aloud but meant only for her.
“You’re my wife.
You’re Illya’s mother.
And every second we spend in this castle is a second I spend trying to figure out how to tear this whole cursed system down so you don’t have to die.”
Irisviel leaned her head lightly against his shoulder, closing her eyes.
She smelled faintly of winter air and the lavender soap they used in private.
“We knew the price when we began this, Kiritsugu.
The Grail…
it’s the only way to break the cycle.
For Illya.
For everyone.”
“I know,” Kiritsugu murmured, resting his chin against her hair for a brief, fleeting second.
“I know.”
He pulled back slowly, his posture hardening once more as he looked toward the small wooden desk in the corner of the room, where a map of Fuyuki City lay unrolled alongside lists of logistics, sniper perches, and safehouses.
“Acht gave us the catalyst,” Kiritsugu said, stepping away from the fire and picking up a pencil from the desk.
“The sheath of the Holy Sword.
With that, we’ll draw the strongest Servant in the war.”
“Saber,” Irisviel said, stepping up beside the desk.
“A King of Knights.
A hero of absolute chivalry.”
A bitter, quiet sneer touched the corner of Kiritsugu’s mouth as he stared at the map.
‘A King of Knights,’ he thought, his eyes darkening.
‘An honorable hero who believes in pride and noble duels on an open field.
The absolute worst possible match for an assassin.’
“Chivalry doesn’t win wars, Iri,” Kiritsugu said aloud, his pencil tracing a line along the Mion River in Fuyuki.
“It gets people killed.
When the summoning is done, you will act as her Master in public.
Let the world—and our enemies—think the Einzbern family sent a proud knight and a noble lady to fight their war.”
Irisviel looked at the map, understanding settling behind her eyes.
“And while they watch the knight…”
“I’ll be in the shadows,” Kiritsugu said, pressing the pencil point into the paper until the lead snapped.
“Doing what must be done.”