Over the next week, the Demon Slayer Corps continued their efforts. They sent teams to gather the bodies of those they hoped to revive while setting up a trap to lure out their target.
These preparations were all handled by Ubuyashiki Kagaya.
Due to her unique status, Uchiha Hikari needed to stay under the radar to avoid alerting Muzan too early. So, after telling Tanjiro to "ping her in the group chat if anything comes up," she activated "Shangri-La" and took Esdeath to Kyushu, thousands of miles away.
Once they arrived, Hikari pulled out two maps—one provided by Kagaya, the other a modern Japan map from the Dragon Road world—and started scouring the area.
"…According to the maps, it should be around here."
After some exploration and cross-referencing, Hikari pinpointed a sparsely populated, hilly region.
On the modern map, this area was "Hishikari Town," a small but populated settlement. In this era, though, it was just barren land, with only a few scattered villages within a dozens-of-miles radius. The isolation made it scenic and free of demon activity, so even if they caused a ruckus, Muzan's side wouldn't notice.
Without delay, Hikari took out a capsule containing the World Codex: Rongorongo and infused it with a wisp of mental energy.
A subtle aura stirred.
The beastly eye on the codex's cover rotated slightly, and a clear wave of mental energy radiated outward, spreading like fine mist in all directions. Moments later, images began to appear on the blank pages, shifting from blurry to vivid, accompanied by tiny, detailed text annotations.
Hikari infused more mental energy, and the minuscule, mosquito-like text became clear, projecting into her mind:
"Unknown Location 1.
Geographical Features: …
Species Distribution: …
…"
In less than half a page, thousands of words densely recorded the underground mineral deposits, water systems, human villages, and animal and plant populations within a dozens-of-miles radius—a real-time encyclopedia. Through experimentation, Hikari found she could use her mental energy to rename "unknown" entries—like changing "Unknown Location 1" to "Hishikari Mine"—or even manually fill in details about terrain or unfamiliar creatures.
"…Pretty handy," Hikari said with a faint smile, pleased after figuring out how it worked.
She hadn't wanted to use the World Codex lightly, as its pages were precious and not to be wasted. But she needed to test it to understand its mechanics. In the face of 200 tons of gold, a little waste was no big deal.
"Based on this, scanning an island the size of Japan with the Codex would take about three pages…"
"Scanning the entire Earth would probably fill the remaining half of the book…"
"But unnecessary info can be erased with mental energy or manually simplified."
Overall, not bad.
With the gold mine's location confirmed, she could now negotiate terms with Kagaya.
As for mining it…
Partnering with the Ubuyashiki family was a solid option—they had influence in the area and were trustworthy. Alternatively, she could use "Yasogami" to control a local Kyushu tycoon, which would also work in a pinch.
Decision made, Hikari tucked away the marked map and stretched lazily. "Alright, let's go, Esdeath."
"…Go where?"
"We're already here, so let's do some sightseeing. I heard there's a 'Yunoo Waterfall' nearby—pretty spectacular. We'll check it out and try some local food."
"Oh."
Esdeath nodded indifferently, following Hikari's lead.
As she turned, Hikari paused, her gaze drifting toward the setting sun.
In this era, the country just across the water from Japan… it should've just ended its feudal monarchy, right?
If she got the chance, she might swing by to take a look and see if there was anything she could do.
…
Two days later, Hikari returned to the Demon Slayer Corps headquarters.
The courtyard was now filled with bodies.
Most were incomplete, their bones bearing the scars of wounds from their final moments. Others, buried underground for years, had decayed to the point where only vague outlines remained.
"Hikari-san, you're back," Tanjiro said.
"These are the people we've gathered so far—mostly Corps members and their families, plus a few outsiders. The list is still being compiled; I'll show it to you later."
Tanjiro was directing the "Hidden" members to clean the dirt off the bodies and seal them simply. Nearby, Kanzaki Aoi and Nezuko were also helping out.
Speaking of which…
It had been a while since the Kamado family was brought back via Edo Tensei.
For the past six months, they'd stayed at the headquarters, helping with simple physical tasks and occasionally assisting at the Butterfly Mansion when staff was short. Thanks to their Edo Tensei bodies, they felt no hunger or fatigue and recovered stamina quickly—basically human perpetual motion machines.
Which also meant… if outsiders discovered their existence, it could cause some serious trouble.
"Hi, Hikari-neesan," Nezuko said, approaching with her brother and greeting Hikari in slightly halting speech.
"Oh, Nezuko can talk now?" Hikari asked, surprised.
"Yeah," Tanjiro replied. "Thanks to the medicine from Tamayo-san and Shinobu-san, Nezuko's no longer afraid of sunlight and can think and speak like a normal human. She's just a bit slower to react."
Hikari nodded in understanding.
Then Tanjiro hesitated, lowering his voice. "Um… Hikari-san, according to that Kami-sama, reviving someone requires not just their body but also their soul nearby. Do you have any ideas for that?"
"Well…"
There were two options.
First, like with Aoi and the others, use Edo Tensei to bring them back temporarily, then place the Edo Tensei body with the original corpse. The problem? Even using demons as sacrifices, they'd need a ton of them, and that wasn't feasible short-term.
The second option was simpler.
"Kikyo's shikigami bugs should be able to gather souls, right? We can just have her come over and take a look."
…
Starting the next day, people began arriving in the Demon Slayer world through Tanjiro.
First up, naturally, were Yamato and Eri.
They'd spent a week or two at Dr. Brief's, finishing all their tests and giving over a dozen blood samples. With nothing left to do, they eagerly popped over to check in.
Eri blended in fine—aside from her striking looks and inability to speak, she didn't stand out much. Her long red hair wasn't even that unusual in this world; people might just assume she ate too many tomatoes or watermelons.
…Okay, that sounds absurd, but consider Mitsuri Kanroji's gradient pink hair from eating too many sakura mochi, or Kyojuro Rengoku's gold-and-red hair from his ancestors' shrimp obsession…
Let's just say it's mystical.
Yamato, on the other hand, was impossible to ignore.
At 2.6 meters tall, she towered over everyone in the Demon Slayer world. Even the 2.2-meter-tall Rock Hashira, Himejima Gyomei, looked like a kid next to her.
As for strength…
That afternoon, at the invitation of a few Hashira, Yamato had a "friendly" sparring match.
She accidentally gave two of them compound arm fractures and snapped several Nichirin Blades with her Armament Haki. Hikari had to step in, healing them with Palm Sage Technique and compensating with a few laser swords.
—Courtesy of Bulma, of course.
After leaving the Demon Slayer world last time, Bulma hadn't entirely dropped her lightsaber project, though it was delayed by distractions like the Four Souls Jewel hunt. Hearing the Corps was gearing up to face Muzan, she rushed to finish a few weapons and sent them over via Hikari, who passed them to Sanemi Shinazugawa and others.
Yamato, meanwhile, looked sheepish, rubbing her head. "Sorry, I didn't realize you guys were that weak… I wouldn't have used 'Sakura' if I'd known…"
"…"
The injured Sanemi and others weren't too upset, just stunned by Yamato's strength. "Hikari-san's friends are ridiculously strong…"
Some even recalled speculation about Hikari's identity. "So, Tanjiro really was taken to the heavens for training, wasn't he?"
"Well…"
In a way, they weren't wrong.
Tanjiro had trained at Korin Tower, which could arguably be called "the heavens." Once the Muzan situation was resolved, the other Hashira could train there too. They might not reach insane heights, but learning to use "ki" to mitigate the lifespan-shortening side effects of their Marks would be worth it.
Next to arrive was Kikyo.
She'd already heard about the "soul collection" plan from Hikari in the group chat, so upon arriving, she immediately assessed the situation.
"How's it looking?" Hikari asked.
"…The boundary between life and death here is looser than in my world, Bulma's, or yours. Many spirits linger near the loved ones they cared about in life. There are several right here in this courtyard."
As Kikyo spoke, she began controlling her shikigami bugs.
Under her guidance, Hikari caught glimpses of humanoid silhouettes that grew clearer as the bugs made contact.
Even the Demon Slayer Corps members nearby started to vaguely see the outlines.
Muichiro Tokito's eyes widened, locking onto a figure that looked almost identical to him. "It's… my brother…"
Sanemi Shinazugawa and Shinobu Kocho stared at the same figure. "Kanae…"
And Tanjiro and Giyu Tomioka: "…Sabito-senpai? Makomo-neesan?"
Yuichiro Tokito, Kanae Kocho, Sabito, Ruka Rengoku… these spirits from the original story now stood in the courtyard, silently facing or quietly speaking with Muichiro and the others, wiping tears from their faces with gentle smiles.
Not all of them had bodies collected, though.
For instance, Sabito and Makomo had died over three years ago, their bodies devoured by the Hand Demon, leaving no remains for revival. Ruka Rengoku, Kyojuro's mother, had passed nearly a decade ago from illness, also ineligible.
But since their souls hadn't yet reincarnated, Kikyo's shikigami bugs had gathered them here, where they now looked tenderly at their sons, siblings, or lovers.
The heartfelt scene left Eri and Yamato a bit emotional.
Hikari pursed her lips, tilting her head slightly as she mulled over Kikyo's observation.
The varying looseness of life-death boundaries across worlds likely tied to their reincarnation systems.
The Naruto and Dragon Ball worlds had structured afterlife spaces—Pure Land managed by the Sage of the Six Paths, or the Other World run by King Yama—where reincarnation or revival followed strict rules. The Inuyasha world was similar; though no underworld ruler appeared, crossing over required special moves like "Meido Zangetsuha" or items like the "Meido Stone" or "Iron Rooster Blood."
The Demon Slayer world, though, had a reincarnation system that seemed to run on autopilot, without a true overseer, making its boundaries looser and blurrier.
Which meant…
"The Jujutsu Kaisen world is probably like this too, right?"
Cursed spirits ran rampant there, and plenty of people saw the spirits of loved ones after death—like a certain sorcerer sliced in half.
As for Miko's world…
That was another story.
The life-death order there was utterly chaotic, likely disrupting even reincarnation, causing countless ghosts to linger in the human world.
"Speaking of which, it's been a while since I visited Miko…"
"Maybe I'll swing by for a 'meal' when I get the chance."
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