"What—?!"
Yushiro's attack missed, and an alarm blared in his heart.
Although he wasn't skilled in combat, he wasn't so weak that he couldn't even touch the enemy's clothes.
Anger and humiliation made Yushiro instantly activate his Blood Demon Art: "Eye Mask: Bewildering Scent!"
A colorless, odorless aura instantly permeated the air.
This was Yushiro's Blood Demon Art that manipulated vision, aiming to make the enemy hallucinate, unable to clearly see his movements and position, and then attack.
However, this level of visual interference was like child's play to Naruto.
Naruto didn't even need to use See-Through World to "see through" the illusion; he relied purely on his perception of killing intent and energy fluctuations. The moment Yushiro's fingertip was about to touch his chest, "Thwack!"
A soft sound.
Naruto's right hand moved first, quick as a ghost, precisely grasping Yushiro's wrist. His movement was as effortless as catching—
—a pouncing fly.
Yushiro felt as if his wrist was clamped by scorching hot iron tongs. That terrifying power instantly rendered him immobile. No matter how he struggled, he couldn't budge an inch!
What shocked Yushiro even more was that a scorching, vast, and life-filled energy emanated from the opponent's palm, causing him, a demon, an instinctive stinging pain and revulsion.
"Let go of me! You monster!"
Yushiro's eyes were bloodshot, his fangs bared, and his other hand desperately reached for Naruto again.
"Noisy!"
Naruto suddenly glared, his azure eyes shooting out a cold gaze.
In that instant, the golden-haired youth who had been sunny and amiable a second ago transformed into a Demon King, like a Shinigami. That oppressive feeling of "Shadow Peak" and Shadow Monarch instantly made Yushiro feel as if he had fallen into an ice cellar, filling him with despair.
Naruto released his hand, and the furiously protective Yushiro, now terrified, knelt on the ground, trembling.
"Yushiro!"
Tamayo's clear yet undeniably authoritative voice rang out.
Everything that just happened occurred too quickly; she hadn't even had time to stop Yushiro before he was already kneeling in fright.
"Sir—I'm truly sorry—"
Tamayo quickly stepped forward and apologized to Naruto.
"It's fine."
"I just hope Sister Tamayo keeps her subordinate in check. Next time—there might not be a next time."
Naruto entered the room, smelling a faint scent of disinfectant and old books.
Tamayo helped Yushiro up, dismissed him, and then politely asked, "Please don't be offended, Sir. We have always been evading the pursuit of demons, and Yushiro mistakenly thought you were a demon chasing us, which is why he acted rashly."
"As for the scent on your body—it is indeed not like a demon's—"
A wary expression still flickered in Tamayo's eyes.
Although she had never seen the golden-haired youth before and couldn't confirm if he was a new member of the Twelve Kizuki, the power Naruto displayed was enough to cause concern.
"Miss Tamayo, please look at this first."
Naruto took out a crystal bottle and a blue flower.
"This—this is—"
Miss Tamayo's gaze was completely drawn to the two items in Naruto's hand, filled with incredible excitement and the fervent investigative desire of a doctor: "How is this possible—this is that guy's blood—and—the legendary blue spider lily?!"
Her voice was trembling slightly, which was extremely rare for someone usually so calm.
"That's right."
Naruto nodded, then, after introducing himself, briefly recounted how he single-handedly entered the Infinity Castle and eliminated the Twelve Kizuki and Muzan Kibutsuji.
It was as simple as could be, described with an understatement, but to Tamayo, it was like a thunderclap, her head buzzing and roaring.
"Sir Naruto, you mean—the Twelve Kizuki and that guy—are all dead?"
Tamayo still couldn't quite believe it.
She didn't even dare to directly call Muzan Kibutsuji by name.
Due to the blood curse, if any other demon spoke his name or information, the "curse" would activate and destroy them, giving him the power of life and death over all demons.
"Wait, that guy's blood is here, and you called him by name."
"It—it seems—Muzan—Muzan Kibutsuji is truly dead."
After confirming from multiple sources, Tamayo finally breathed a complete sigh of relief. Her nerves, taut for a thousand years, now relaxed, and she nearly slumped, quickly bracing herself on the edge of the table with both hands.
"He's dead—Muzan Kibutsuji is finally dead—"
Tamayo alternated between crying and laughing, then finally raised her hand to wipe away the tears from the corners of her eyes, calming herself. She said to Naruto, "Please excuse my behavior, Sir."
"Your divine bravery and power, Sir, I have only seen on a swordsman from a thousand years ago, no, your strength even far surpasses his."
Tamayo took a deep breath, her expression solemn and curious.
"What exactly do you need me to do?"
Naruto slightly extended the crystal bottle and the blue spider lily in his hand, his tone serious: "Miss Tamayo, as you can see, although I killed Muzan Kibutsuji, he retaliated before his death, injecting his blood into my body."
"Now—I have also become a demon who fears sunlight."
Naruto spread his hands.
"Fortunately, I found Muzan Kibutsuji's research materials in the Infinity Castle and learned about the blue spider lily and your existence, Miss Tamayo. So I hope you can use the Demon King's blood and the blue spider lily to research a medicine that will allow me to be fearless of sunlight."
"Fearless of sunlight?"
Miss Tamayo hesitated for a moment.
Once such a medicine was researched, the other party would become a Demon King without weaknesses.
If he were to harm the human world, even if Yoriichi Tsugikuni were resurrected, it would be useless.
"No, it was Sir Naruto who killed Muzan Kibutsuji and the Twelve Kizuki, ending a thousand years of calamity. Now he just wants to break free from the curse of fearing sunlight. How can I maliciously speculate about Sir Naruto with the heart of a villain?"
"Besides—with Sir Naruto's strength, even without taking the blue spider lily, no one in the world can oppose him."
To be able to single-handedly take on the Infinity Castle, kill the Twelve Kizuki and Muzan Kibutsuji, even the strongest swordsman from a thousand years ago, Yoriichi Tsugikuni, couldn't do that.
After countless thoughts flashed through her mind, Tamayo nodded and agreed. "Sir Naruto, I will do my best."
"Good, I'll leave it to you, Miss Tamayo."
"Through this badge, you can contact me at any time."
Naruto took out an Underground City team badge and temporarily entrusted it to Tamayo for safekeeping, so she could notify him once the medicine was ready.
In reality.
Even if Tamayo didn't develop the blue spider lily medicine, Naruto could still overcome sunlight by directly consuming a large amount of blue spider lilies.
After all, in the original Demon Slayer story, Nezuko, who became a demon, was able to overcome the sun precisely because she had long consumed blue spider lilies at home.
Tanjiro was also like this.
That's why Tanjiro could directly become a Perfect Demon King after Muzan injected his blood into him.
This method has a drawback, which is that it's slow to take effect and requires consuming a large amount of blue spider lilies.