Gyutaro already had his own familiar way of fighting.
Oboro did not intend to teach him offensive combat techniques; instead, he focused on movement, footwork, and general tactical principles.
These were the most valuable things for Gyutaro to master.
As for actual combat experience, that he would have to accumulate himself through constant battle.
During this period, Gyutaro and Daki remained inside Oboro's residence and did not step outside.
The three Hashira who had been watching the city had no plans to leave yet.
But neither did they dare to attack rashly.
Oboro had expected they would eventually take action — for killing demons was their sworn duty.
He did not imagine they would eventually decide to withdraw.
This surprised him greatly.
For the inherited will within the Demon Slayer Corps was pure and resolute; they did not retreat easily.
"It seems the current leader of the Corps… is quite extraordinary."
Oboro realized something and made that assessment quietly.
Under Oboro's guidance, Gyutaro's close‑combat ability improved rapidly.
In terms of raw talent alone, even if placed in the world of Hunter × Hunter, he would still stand out among ordinary people and could easily have become a capable Nen user.
But there was still a gap between him and the true geniuses Oboro had known — not in physical strength, but in mindset and thinking.
Oboro protected Gyutaro for a whole year and provided him with all the "food" he needed. Almost every night, he sparred personally with Gyutaro to help him grow stronger.
As for Daki, Oboro paid her very little attention… only occasionally giving her simple lessons to help her make better use of her Blood Demon Arts in battle.
Ultimately, the strength of the siblings depended entirely on Gyutaro — not her.
Later, Gyutaro and Daki left the estate to carry out a mission Oboro had assigned them.
It was also their only true trial.
If they succeeded, it would mean they had completed their training.
From then on, they would be free to act as they wished and do whatever they desired — exactly the reward Oboro had promised in exchange for their loyalty and power.
The mission was: hunt down and kill all Upper Ranks serving under Muzan.
It was a necessary step for Gyutaro. Demons gained power by devouring their own kind, and this process accelerated the evolution of their bodies… something both the inheritors and Muzan's faction had already recognized as a great opportunity.
Without doing so, growing step‑by‑step would simply take too long.
Whether he could succeed or not was entirely up to Gyutaro himself.
Oboro had given him the black haori and chosen him as a special "seed" precisely because he saw immense potential in him.
In her heart, however, Daki had no wish to follow Oboro's orders. Her true dream was to become the most famous and beautiful courtesan in the land, admired and remembered forever.
Only her deep fear of Oboro kept her from speaking her mind.
In her eyes, as soon as her brother killed those Upper Ranks, the two of them would finally be free from his control.
Gyutaro, on the other hand, treated Oboro with great respect — a fact that irritated Daki deeply.
---
"Have I already gathered this many?"
One day, Oboro opened his system inventory and smiled softly.
Every slot in the interface was now filled with cards.
Some of them had already expired — almost all were from the flesh and blood of ordinary demons.
The most valuable card among them was the Silver‑Rank Bloodline card obtained from Yasuhara after his evolution.
Next were the skill cards containing various Blood Demon Arts...and a large number of Nichirin Blades.
The Swordsmith Village had belonged to the Demon Slayer Corps for generations and had never fallen under the control of the Shogunate.
These swords were powerful weapons capable of killing demons, forged from special materials and possessing unique strength — far superior to ordinary blades.
They were among the few valuable resources this world had to offer. And the decades of war and chaos that had swept the land before were all part of Oboro's doing.
The greater the chaos, the more people died… and the easier it became for Oboro to "collect" what was left behind.
He had not been idling away his time all these years.
The reason he had encouraged closer ties between the Shogunate and the Demon Slayer Corps was simply to make it easier to "harvest" results later.
"But… what surprises me most is the appearance of this card."
Oboro's gaze settled on one particular card.
It was very special — a type he had obtained only recently. In the past, his system had been unable to convert this kind of resource… but now it could.
This change happened because, after witnessing and understanding the true nature of inherited will, Oboro's own soul had strengthened slightly — and the system's functions had improved as a result.
Experience Card.
Converting this type of card required drawing upon the soul power of the target…
The damage caused to them was irreversible.
This specific card was of Iron rank and not particularly rare — meaning the original target had not been very powerful.
Yet its effect was remarkable: it could significantly increase the combat experience of whoever used it.
In practical terms, it allowed Oboro to take an ordinary person straight off the street and instantly turn them into a seasoned "master" with years of battle knowledge.
It would not grant them raw strength…
…but experience was one of the most important things of all.
Right now, Oboro's inventory contained Bloodline cards (classified as sources of contamination), Weapon cards (Nichirin Blades), Skill cards (Blood Demon Arts), and now Experience Cards.
With these four types of cards, he could create a powerful warrior out of thin air.
Although he had quite a large quantity, the rank — and thus the rarity — of most cards was not high… Oboro planned to continue "cultivating" in this world.
He intended to use most of these resources on members of the three major factions, artificially accelerating their growth once again — like forcing seedlings to grow faster with extra fertilizer and water.
He would feed them with low‑level cards, then harvest even higher‑level cards in return.
Based on his assessment of this world's power system, the highest possible card rank available would be Gold — which was clear from the fact that Yasuhara's evolved flesh and blood had only reached Silver.
Muzan himself and Sun Breathing were likely the only resources worthy of Gold rank.
And as the overall power system grew and evolved, every resource available would also improve… meaning in the future, he might even obtain Platinum‑rank cards.
That would save him a great deal of time.
And it meant he could leave the world of Demon Slayer earlier than planned.
Oboro had a premonition: his next world would be far more difficult. Judging from the strength of his soul — which had originally come from Hunter × Hunter — his first world had been the weakest and undoubtedly belonged to the lowest tier. The next one would only be harder, never easier.
He also had no idea what kind of situation he would face.
That was exactly why he needed enough resources to prepare for any eventuality… so that even if he encountered great danger in the next world, he would still have hidden trump cards to rely on.
Unlike here, in Demon Slayer, where he could stay safely behind the scenes and control events easily without needing to intervene or participate too deeply…
Also, precisely because this was a low‑order world, Oboro was able to perceive the true will of the world and sense the existence of that small "sapling".
This proved that every world possessed its own unique will.
The sapling representing Demon Slayer's will was very weak… and because it was weak, it had entered into an exchange with him.
Oboro's power was, in a sense, enough to destroy this entire world — a genuine threat to the sapling.
And the sapling had no choice but to compromise.
But if he went to a high‑order world… the situation would be completely different.
Aside from whether he would still be able to sense the world's will, the worst possible outcome would be if that will turned against him…
At the very least, in Hunter × Hunter — also a high‑order world — Oboro had never felt or perceived anything resembling a world's will, even when he was at his peak strength.
He had entered Hunter × Hunter with nothing more than an ordinary human soul from Earth.
Back then, he had been too weak — a mere stowaway — and far too insignificant to attract the attention of the world's will.
But now… things were different.
Already, upon arriving in Demon Slayer, the sapling had quickly and actively reached out to make contact with him.
Not every world would treat him kindly.
The only reason the sapling tolerated him was the massive imbalance in power between them.
If Oboro had been the weaker one, the world's will might not have been able to kill him directly… but it could have guided the fates of others and manipulated events.
For example, it could have arranged circumstances to force him to meet Muzan much earlier.
And if he had angered the will in some way… his fate would have been sealed.
That possibility was very real.
It was exactly because he realized all this that Oboro did not leave Demon Slayer immediately. For him, this place was essentially a refueling station.
Even though its power system was low‑level, it still contained plenty of resources worth using.
And he had to make every preparation he could.
____________________
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