Overwhelming darkness poured down like ink, forming a gigantic black-robed figure with a crown on its head, like a monarch dominating death and shadows, gazing down upon all living beings from the abyss.
"You—who exactly are you?!"
Kibutsuji Muzan, who had already broken free from the shackles of death, achieved immortality, and often prided himself on being a perfect life form, was instantly horrified and terrified.
Being targeted by Naruto's mental consciousness felt like being watched by a Shinigami.
This reminded Kibutsuji Muzan of his human self during the Sengoku period, afflicted by an incurable disease.
Escape!
Kibutsuji Muzan's consciousness wanted to flee.
Naruto's mental pressure even surpassed Yoriichi Tsugikuni's suppression of him.
Unfortunately, without a cell as a medium, Kibutsuji Muzan's consciousness couldn't leave at all.
"Your body is already under my control. To want to escape is simply a pipe dream."
Naruto's Shadow Clone raised his palm, fingers spread, with his middle and index fingers held straight together. A bright Chakra flame ignited at his fingertips, which he then touched to Kibutsuji Muzan's brow.
Instantly.
The Four Symbols Seal formed, and a paint black 'Seal' character appeared on Kibutsuji Muzan's brow.
Centered on the 'Seal' character, tadpole-like incantations radiated outwards. Yin Release Chakra transformed into transparent tentacles, like a giant fishing net, enveloping Kibutsuji Muzan's entire body. It was also like a Uzumaki, sucking and devouring all of Kibutsuji Muzan's consciousness, sealing it within the sealing space.
As for Naruto, the moment the Four Symbols Seal was completed, he released the Mind Body Switch Technique, allowing his mental consciousness to return to his main body.
"That's the end of it."
Naruto breathed a slight sigh of relief.
Kibutsuji Muzan's combat strength wasn't actually that strong, at most he was a Jonin, an elite Jonin.
But without intelligence, his difficulty to kill was comparable to Orochimaru.
Moreover, Naruto wasn't simply trying to kill him, but to collect the blood of the unconscious Demon King to create a Perfect Demon King potion.
Otherwise, if he just controlled him and threw him into the sun, he would turn to ash.
"Next is bloodletting, and then letting the 'scum boss' bask in the sun."
Naruto took out the Mithril jar from the Goblin Slayer World used for Dragon Blood from his item bar, and then bled Kibutsuji Muzan.
After draining Kibutsuji Muzan's blood, he sealed it up and put it into his item bar.
With this pure Demon King blood, Naruto could already transform into a Demon King physique.
However, this was clearly not yet perfect.
It required the Blue Spider Lily.
Otherwise, if he couldn't face the sun, what was the difference between him and a vampire zombie?
With the Blue Spider Lily, he could research a Perfect Demon King potion.
By then, upon becoming a Perfect Demon King, Naruto's cells would be Naruto cells. He would not only gain immortality but also super healing, indestructibility, Blood Demon Art, and the ability to mass-produce demons.
"Let's burn Kibutsuji Muzan's corpse first."
Suppressing his anticipation, Naruto raised his hand and casually waved it, immediately retracting the Absolute Cube that enveloped the alternate dimension.
After the Infinity Castle collapsed, with the Absolute Cube removed, Naruto returned directly to the Demon Slayer World.
It was daytime.
The sun hung high, casting down scorching, pure sunlight.
Kibutsuji Muzan was fortunate; after avoiding the sun for a thousand years, he finally basked in it today, turning to ash in its embrace.
[Hidden Quest "Speedrun Demon Slayer" Completed]
[Starting Quest Evaluation:
1. Eliminate the Twelve Kizuki and Demon King Kibutsuji Muzan within one year √
2. Eliminate the Twelve Kizuki and Demon King Kibutsuji Muzan within one month √
3. Eliminate the Twelve Kizuki and Demon King Kibutsuji Muzan within one week √
4. Eliminate within one day √
5. Eliminate within one hour — √
6. Eliminate within one minute — .. — ×
Overall Rating: S!]
[Quest Reward: Gained 40,000 EXP, Gained 8,000 Exchange Coupons, Gained Legacy Title "Demon Exterminator", Gained Bronze-level Underground City Key * 1, Gained Favor of the Demon Slayer World's World Will!]
[Side Quest "Solo Infinity Castle" Completed]
[Quest Reward: Gained 20,000 EXP, 4,000 Exchange Coupons]
Naruto looked at the pop-up window in front of him, a little stunned.
Especially the speedrun score for Demon Slayer.
An S-rank evaluation was within expectations.
Completing it within an hour would grant an S-rank.
What shocked and puzzled Naruto was how a one-minute speedrun could be achieved. How could one speedrun Demon Slayer in one minute? That was too difficult.
It should be noted that the timer for this speedrun began when the hidden quest was triggered.
This meant that the clock had already started ticking when Naruto was at the Demon Slayer Corps Headquarters.
He would have to find the Infinity Castle from the Demon Slayer Corps Headquarters and eliminate the Twelve Kizuki and Demon King Kibutsuji Muzan within one minute to achieve an SS-rank rating.
Undoubtedly, this was an impossible task.
At least—
The current Naruto couldn't do it.
"I'm satisfied with an S-rank rating."
Naruto opened the [Messages] panel, and other pop-up windows appeared.
Aside from several quest completion pop-ups, there were also level-up notifications.
Completing all the quests in the Demon Slayer World only allowed Naruto to level up twice.
"The key is still the Bronze-level Underground City Key."
"I wonder where this key connects to."
Naruto glanced at the new Bronze-level Underground City Key, then flipped his hand and put it away.
He wasn't in a hurry to open the new Underground City.
"Next is the Underground City Shop."
Naruto's eyes moved, and he opened the Underground City Shop.
The items in the shop, besides those from the Goblin Slayer World, now included items from the Demon Slayer World.
For example, various breathing techniques, nichirin blades, Demon Slayer Corps uniforms, and so on.
"Too bad there's no Blood Demon Art, wait—this is—"
Naruto saw the Blue Spider Lily!
One flower only cost 50 exchange coupons.
"This is a huge gain; no need to search for Blue Spider Lilies everywhere now."
"However, according to the system's friendly reminder, directly consuming one Blue Spider Lily cannot eliminate the side effect of becoming a demon—fear of sunlight."
"Especially the side effects of a Demon King-level."
"It seems further research is needed," Naruto's brow twitched.
He had three candidates in mind.
One was Miss Tamayo from the Demon Slayer World, another was Orochimaru from the Fire Shadow World, and the last was the Witch from the Goblin Slayer World.
Logically, Miss Tamayo was definitely the most suitable, as she herself was a demon, adept at research, and understood demons best.
Although Orochimaru was extremely skilled in research, he ultimately didn't understand demons.
The Witch was also similar; her expertise lay in magic, appraisal, and crafting magical items.
"It seems I still need to find Miss Tamayo."
Only by researching a flawless Demon King potion would this trip to the Demon Slayer World be considered perfect.
Naruto didn't rush to leave but exchanged for other items in the Underground City Shop.
For example, See-Through World.
This effect was similar to the Byakugan's "X-ray vision" ability; it allowed one to see through bodies, predict movements, and clearly observe the expansion and contraction of an opponent's lungs and the flow of blood vessels.
Since people in the Demon Slayer World didn't have Chakra, it was uncertain whether See-Through World could see Chakra, but Naruto still exchanged for it, as it wasn't expensive anyway.