To show Chaldea's sincerity, Dr. Roman decided to take Reuel to one of the main technical rooms. The place looked like a research and development department, full of magical tools and futuristic scientific equipment—an odd yet strangely harmonious blend.
A girl with long black hair, wearing a dress that combined red and blue hues, greeted them with a warm smile.
"Hello. I'm Leonardo da Vinci, Chaldea's technical advisor. I've heard about your situation from Dr. Roman," she said confidently. "You're looking for information about this world's magic system, right?"
No sooner had Da Vinci finished her sentence than a small commotion broke out from the back.
One of the ship girls tilted her head in confusion. "Da Vinci?! How the hell is Leonardo da Vinci such a gorgeous girl?!"
Everyone fell silent for a moment, staring at the beautiful green-eyed girl before them. Not one of them could connect this figure with the Renaissance genius they'd learned about from history books.
"This world is full of wonders," Da Vinci replied lightly. "And let me give you another fun fact... King Arthur's a cute girl too, and Nero—well, she's cute as hell. They actually look quite similar."
Reuel didn't waste time with pleasantries.
"I need a solid magic system. And a summoning circle—something I can use to call forth Heroic Spirits."
Da Vinci nodded, then walked over to a nearby table. She opened an old drawer and pulled out several dusty books.
"As for magic info, we have some basic documentation here. The rest... is still scattered and needs compiling. We'll hand it over once you've helped us resolve the current singularity," she explained.
She handed the old books to Reuel.
"The summoning method for Heroic Spirits is actually pretty straightforward. What we summon isn't their actual body, but a spiritual manifestation—a kind of clone of their soul's essence."
"Draw the summoning circle, recite the incantation, then follow the proper procedure. The key component is the relic—a sacred item left behind from their life. Without it, the odds of a successful summon are pretty slim. And of course, the Heroic Spirit has to be willing to respond to the call."
Reuel glanced at the diagram in the book.
A magic circle? Not hard. He was confident he could replicate it. If a cat or a tiger could bark, he could copy basic magic too.
As for relics... even if Chaldea didn't have any, he was sure he could get them from other worlds—using methods only someone like him could pull off.
"Servants—Heroic Spirits—require a supply of magical energy from their Master to maintain their existence," Da Vinci reminded him. "Without magic circuits, it'll be difficult to keep them anchored in this world."
"She's right," Ritsuka added with concern. "If you don't have magic circuits, your Heroic Spirit could just disappear."
Reuel merely smiled, unbothered.
"No problem. I've got a Rubik's Cube—mental edition. If they're not compatible with its magic, we'll just recalibrate."
Deep down, Reuel knew exactly what kind of power he possessed.
His psionic energy was immense—far beyond standard magic. For those who understood, the difference between psionics and magic was merely semantics. Both were forms of manipulating fundamental energy.
Even if the whole world denied it, Reuel knew: he could sustain any Heroic Spirit, as long as he wished it.
After all, the true power of the Emperor of Mankind could split the galaxy with a single stroke—if he truly meant it.
And Reuel? He was his heir.
He lifted his chin slightly, full of confidence.
Gudako looked puzzled. "Huh? Fixing magic? What do you mean...?"
But Reuel didn't answer. He just smiled mysteriously, letting the enigma hang in the air.
Having received the books on magic and the Heroic Spirit summoning info as a sort of "advance deposit," Reuel decided it was time to start helping Chaldea resolve the singularity crisis.
Some time later, everyone returned to their small temporary room.
Upon arriving in the small room—still surrounded by crumbling walls from the previous incident—Reuel lifted his gaze.
His eyes were immediately drawn to a glowing blue globe suspended in the air, held aloft by an invisible force field.
On the surface of the world map, several locations emitted soft, pulsing white lights.
"That's the Chaldeas—Chaldea's Earth Environment Simulation Model," Roman explained, standing beside Reuel and pointing at the orb. "One of Chaldea's most important devices."
"Through this, we can observe the future of Earth. It also functions as a map of humanity's historical progress."
Roman then pointed to seven glowing spots on the globe.
"Due to the 'Incineration of Humanity' incident, seven singularities have appeared. Each one is a crucial node in human history."
He rotated the map view, zooming in on one of the points.
"We've successfully identified one of them. It's likely in France, year 1431."
Roman turned to face all of them, his expression serious.
"If we travel to that point, recover the Holy Grail that's corrupting the timeline, and repair the flow of history... that singularity will return to normal."
Reuel narrowed his eyes.
"The Hundred Years' War and the Evil Dragon of Orléans. I know that place."
A thin smile crept across his face.
"Jeanne d'Arc... both Ruler and her Alter—Avenger—version must be there. I'll try to bring them face to face."
Formidable stepped forward. "But... how are we going to get there?"
"Through spiritron transfer," Roman answered.
He then led them toward a large device standing prominently in the center of the room—something between an altar and a laboratory.
"This is the Spiritron Calculation Engine. It converts the Master's body into a spiritual entity and projects it across various eras of history."
Roman ran his hand along the side of the machine, triggering a holographic control panel to appear.
"This technology is incredibly dangerous. In essence, it's a time machine. That's why every use must be officially approved by the United Nations."
Roman shrugged, a wry smile on his face.
"But since humanity's been wiped out... well, there's no one left to stop us."
"..."
Richelieu stepped forward, eyes sparkling.
"This is amazing... I've heard the Sirens are researching ways to create parallel worlds, but I've never seen actual results."
The ability to travel through time was clearly the pinnacle of technology—regardless of which world one came from.
Roman looked around at everyone.
"If there are no more questions, get ready. I'm starting the transfer to the singularity point."
"I'll be supporting the operation from here." Roman began calibrating the projection and tallying the number of participants.
"—Wait!!!"
Reuel's sharp voice cut through the serious mood.
"I have one personal request."
He pointed at the spiritron transfer device with a serious expression.
"Could you give me a blueprint copy of this machine? I can trade it for gold, silver, or any other resources you need."
Roman fell silent for a moment, staring at Reuel, then slowly nodded—realizing this wasn't an impulsive request.
While the others made their final preparations, Reuel narrowed his eyes, staring at the massive machine with intense interest.
Technology like this... If I could bring it to the Naruto universe, I could unlock limitless possibilities. I might even...rewrite shinobi history itself.
Although Kaguya is often seen as a villain in the history of the Naruto world, Reuel saw her from a different perspective.
To most, Kaguya was an unstoppable threat—the source of chaos and the beginning of all conflict. But to Reuel, she was simply a mother... betrayed by her own children. A woman not trusted by her husband, hunted by her own clan—the Ōtsutsuki—and ultimately sacrificed to feed the Divine Tree, the incarnation of the Jūbi itself.
And now, with this machine, Reuel saw an opportunity.
If I could win Kaguya's heart... wouldn't that be something?
He held back a smile. I'd become the father of Hagoromo and Hamura, the two immortal Sages. Hahaha...
The laughter echoed only in his mind.
But that wasn't all. Reuel had far bigger plans.
This spiritron transfer machine could be the key to exploring universes he'd only ever read about in lore and thick tomes. One of them—so tempting in both imagination and ambition—was Warhammer 40K.
The Golden Age of mankind in the Warhammer universe was always portrayed as an era of glory and technological marvels... but ironically, never explained in detail. Even Games Workshop only gave vague hints—little more than scattered fragments that kept fans endlessly curious.
Reuel clenched his fists tightly.
If I could get there, to the Golden Age before the Long Night and the Age of Strife... and copy all their technology...
Of course, he had no intention of altering history. He only wanted to take—or rather, store and study. Still, he understood: the Warhammer universe was far too brutal... and I'm not strong enough to face it just yet.
Reuel's thoughts wandered far, until they were finally broken by the voice of Dr. Romani Archaman.
"Huh? That shouldn't have been possible... But since you're from another world, I suppose it's fine..."
Roman crossed his arms, thinking.
"After this mission's over, I'll try to get you a copy of the blueprints."
He looked at Reuel with a clear curiosity.
"Do you want to use it to change history too?"
Reuel shook his head immediately.
"No, no, that's not the point."
He raised his hands as if to calm any suspicion.
"I'm not planning to mess with any historical timelines... at least not for now."
Everyone in the room stared at him, even Richelieu and Formidable seemed a bit puzzled. Reuel added some clarification.
"Normally, when someone uses the spiritron transfer to go back in time, they can't just return whenever they want. They have to be retrieved using this specific device, and... they can't bring anything back from that era."
He smiled—but not a sly smile this time. It was one of calm confidence.
"But I'm different. I have the ability to open my own space-time gateways. That means, once I get sent to an era, I can open my own gate and come back whenever I want."
Roman fell silent. The Servants present exchanged glances. Even the spiritron transfer machine behind them seemed to hum a little more quietly.
"And with this," Reuel continued, "I can not only make up for regrets I've encountered... but also resolve complicated problems that normal people simply can't."
He stared straight at the holographic panel of Chaldeas.
"For example? The Spirit of Origin from Date A Live—that's been on my to-do list for ages. Or maybe... a few lingering regrets left behind in Honkai Impact."
Reuel chuckled softly.
"My path in life won't be limited to just one world."
---
"So, allow me to explain the details of this mission to you all."
Because Reuel was too focused on staring at the spirit transfer device, the entire group had been delayed for a while. Dr. Roman finally gathered their attention again to repeat the mission briefing.
"You will be traveling to the first Singularity—France, in the year 1431."
"There are two primary objectives for this mission. First, to investigate and correct the Singularity that has appeared—a critical turning point for the survival of mankind at that time."
"In other words, you need to figure out what's messing with history, then fix it."
"No problem," Reuel replied without hesitation.
As someone who knew the Fate Series story from his previous life, Reuel was well aware of the core issue behind the first Singularity. When the time came, he could go straight for the target—skipping most of the initial investigation work if necessary.
"The second task is to investigate the whereabouts of the Holy Grail."
Roman continued, "As you explore the Singularity, you're bound to come across traces or information related to the Holy Grail."
"Even if the timeline is successfully corrected, if the Grail remains in that era, all efforts will have been for nothing."
"In short: destroy the Holy Grail, or take it under your control."
"Understood," Ritsuka replied.
Fujimaru Ritsuka looked a little unsure. But seeing Reuel and the shipgirls standing firmly at his side made him feel slightly more at ease. In a journey across time and worlds, having many allies provided an unmatched sense of security.
"Are all of your companions coming along?" Roman asked, glancing at the shipgirls gathered around Reuel.
"Note that the spirit transfer device can only send a maximum of seven individuals. Anything more than that and the energy required would exceed the system's limits."
Standing beside Reuel were Richelieu, Da Feng, Formidable, and a young blonde girl with bright blue eyes and a European-style rapier at her waist. Adding Fujimaru Ritsuka and Mash Kyrielight brought the total to exactly seven.
"Hello, I'm Joan of Arc. Light cruiser, Trojan Liberty-class—Iris."
Joan introduced herself with confidence and enthusiasm.
"...???"
Roman and Ritsuka exchanged looks, only understanding the "Joan of Arc" part and clearly baffled by the rest.
"Joan of Arc?! How can that be...?!"
"She's Joan of Arc, and I'm also Joan of Arc. Don't think too hard about it," Reuel answered casually, as if it were the most normal thing in the world.
He had arranged this team formation deliberately. Considering their mission was in France, bringing two French ships—Sister Richelieu and Joan of Arc—was a strategic move.
"..."
"..."
"Fine," Roman muttered at last, giving up on logic that couldn't be explained by normal science.
"Once you're transferred to that era as temporary spirits, your first step is to locate the earth's leyline and form a summoning circle."
"With that method, you'll be able to summon Servants freely—but be aware, the Servants that can be summoned are usually those who have a strong connection to the era and location in question."
"Does everyone understand?"
Roman gave the warning like an old father sending his children off to war.
"Understood," Mash replied, nodding firmly.
"In that case... spirit transfer, commencing now."
"Good luck on your journey to restore history."
Dr. Roman's voice echoed through Chaldea's system interface, accompanied by the soft flicker of the operating system coming to life.
The seven of them stood atop the spirit calculation platform. Spiritual particles began swirling, wrapping around their bodies like a glowing mist.
"Anti-summon system—activated."
"Beginning soul transformation."
"Distance to start of spirit transfer... five... four... three... two... one..."
"The entire project is complete."
"First Singularity: Orleans."
Suddenly, the system's voice echoed—loud and mechanical—followed by a digital boom like a muffled explosion:
Boom—shua!
The scenery around them began to distort, collapsing inward as if being swallowed by a black vortex. Light vanished. The dimensions of space and time unraveled chaotically. Reuel and his companions' bodies started to blur—turning transparent, as if they'd lost their anchor to reality.
Their life status shifted to unknown—caught between life and death.
A second felt like a century. And a century passed in the blink of an eye.
---
Reuel slowly opened his eyes.
"Ugh... I'm dizzy... even worse than the Commander's wormhole," he groaned, massaging his temples.
The shipgirls around him were beginning to rise, shaking their heads—some still wobbly, trying to adjust. Mash and Fujimaru Ritsuka also stood, sweeping their gazes across the new surroundings.
The blue sky stretched wide. White clouds drifted peacefully overhead. Green meadows and rolling hills dominated the horizon. In the distance, medieval villages could be seen with thin smoke rising from kitchen chimneys.
They had arrived in France—in the year 1431.
Mash spoke as she observed the area.
"This should be during the Hundred Years' War between England and France. But this region looks... untouched. It's relatively calm."
"Can anyone speak French? Or at least understand the local customs? If not, I can try—"
"Leave it to me, Commander." Richelieu cut in gracefully, patting her chest with confident poise and a dignified smile.
As a Liberty Iris—a true French noblewoman, holy cardinal, bearer of the ancient blue banner of Paris, and Trojan-class light cruiser—there was no one more suited to understanding France than her.
Reuel gave a slight nod, then cleared his throat.
"First priority: locate the spiritual leyline. After that, we prepare the summoning circle to call a Servant."
"Understood."
Mash and Ritsuka replied in unison, almost instinctively.
They responded automatically to Reuel's command—as if his aura of leadership grew naturally, without needing to be established.
---
The location where the spirit transfer landed them was quiet. No crowds. No buildings. Not even soldiers in sight. Everything was open and eerily still.
As they descended the hill, Reuel explained the context of the Singularity to his six companions.
"Broadly speaking, in proper history, Jeanne d'Arc was burned alive by the Inquisition and died in 1431. That became a pivotal turning point in the Hundred Years' War."
"But in this Singularity," he continued, "history diverged."
"Jeanne was indeed burned... but three days later, she came back. Not as a Saint, but as a being consumed by rage: Black Joan. A distorted heroic spirit born of vengeance."
Mash was stunned. "Resurrected...? Because of the Holy Grail?"
Reuel nodded.
"Exactly. She used the Grail to summon seven Servants of the Rider class. Her goal was clear: to destroy France."
"So our mission is clear," he added firmly. "Defeat Black Joan, and secure or destroy the Holy Grail."
---
Silently, Reuel began weighing the forces at play.
On the enemy side: Black Joan plus seven Rider-class Servants.
On his side: Four shipgirls from Azur Lane, plus Ritsuka and Mash. Seven versus eight. Not bad.
"We can fight as a team," he thought. "In the original story, Gudao and Mash handled this alone. If even they could pull it off... there's no reason we can't."
A faint smile appeared on his lips.
"This battle of Orleans... four shipgirls versus eight heroic spirits."
"The advantage is still mine."