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After dealing with the Kasugai Crow and the nichirin blade, Kisaragi Rin bid farewell to Mitsuri, as he now had to visit the two demons in the Demon Slayer Corps alone.
The demon doctor Tamayo and her assistant Yushiro.
Kibutsuji Muzan possessed five brains and seven hearts, and his self-healing ability had reached an unbelievable level.
Three hundred years ago, he could split himself into over eighteen hundred fragments to escape.
To kill him, his various abilities needed to be weakened, and the four types of medicine developed by Tamayo in the original work achieved all of this.
They were: the human-transformation drug, the cell-aging acceleration drug, the division-inhibiting drug, and the cell-destroying drug.
The human-transformation drug consumed Kibutsuji Muzan's time and stamina; the cell-aging acceleration drug aged Kibutsuji Muzan by 9,000 years; the division-inhibiting drug prevented Kibutsuji Muzan from splitting and escaping; and the cell-destroying drug became the fatal blow that led to Kibutsuji Muzan's demise.
The Spider Demon was the bait that lured Muzan to the surface, but these four poisons were the net that created the winning opportunity.
The Workshop could also achieve all of this, but creating something from nothing consumed too much energy; it would be better to obtain the ready-made items from Tamayo and then enhance their effects through the Workshop.
Given Tamayo's identity, it was naturally impossible for her to openly reside in the village; Ubuyashiki Kagaya arranged for her to stay near his own residence, seemingly using this method to express his trust in them.
Only after opening his Heavenly Eyes did Kisaragi Rin find the hidden residence of Yushiro.
A cute calico cat was napping in front of the door, basking in the sun.
Kisaragi Rin picked it up and scratched its chin, making it purr contentedly.
The calico cat named Chachamaru rolled around in Kisaragi Rin's arms, then opened its eyes and immediately froze, looking at Kisaragi Rin with an incredulous expression.
"Chachamaru, is your master home?"
Chachamaru silently jumped out of Kisaragi Rin's arms, suspiciously glanced at the talisman on its chest, confirmed it wasn't missing, and wondered how this person had found it.
"Meow~"
It meowed at Kisaragi Rin, then turned its head to lead the way for him.
Walking through the Japanese-style corridor, Kisaragi Rin finally met the purpose of his visit.
Tamayo was a beautiful woman with long black hair parted in the middle, styled into a large, low bun.
She wore a dark purple kimono adorned with wavy pale purple branches and red flowers, and a wide beige obi tied around her waist.
Her eyes appeared very gentle, like a light purple mist.
Chachamaru was nestled in her arms, rubbing against her, while a green-haired man on the side watched the scene with a distorted expression.
Tamayo gently asked Kisaragi Rin, "How did Mr. Kisaragi Rin find his way here on his own? This should be the place where Mr. Yushiro's abilities are strongest."
"My eyes are special; they can see through everything," Kisaragi Rin replied casually.
"How is that possible? No one can see through my Blood Demon Art!"
Yushiro, hearing Kisaragi Rin's words, immediately retorted.
Kisaragi Rin glanced at him, ignoring him, and directly asked Tamayo, "I want to know, has the medicine targeting Muzan been developed?"
Tamayo frowned slightly, wondering how Kisaragi Rin knew this, but recalling his identity, she explained the current progress: "The Insect Pillar of the Demon Slayer Corps has done a lot of research on poisons. There has been some progress on the aging, cell destruction, and division inhibition parts, but the most crucial human-transformation drug still has many difficulties that haven't been overcome."
"Regarding this part, I have a solution."
Kisaragi Rin took out the prepared Spider Demon from the Workshop; she was already wearing a white kimono woven from spider silk, but her eyes were still a bit dazed, not having recovered from the confusion of her recent birth.
Tamayo sniffed and asked with an uncertain tone, "Is this a demon?"
"That's right, and she's a demon unafraid of sunlight. I'm sure her blood will provide a breakthrough for your human-transformation drug."
Kisaragi Rin made the Spider Demon slightly larger, indicating for Yushiro to come and take blood. The Spider Demon's stats were stronger than his, so there was no need to worry about taking a bit of blood.
"Unafraid of sunlight? The Demon King couldn't achieve that even after a thousand years..."
Although she said this, Tamayo actually believed it. The moment she saw the Spider Demon, she realized that this demon was different.
"How do you seem so familiar with us?"
Yushiro skillfully took out the blood collection equipment, approached the Spider Demon, and pricked her arm.
Unfortunately, his blood collection equipment couldn't penetrate her defense at all.
After several jabs, nothing was collected except for the Spider Demon's curious gaze.
"Release your blood to him," Kisaragi Rin whispered in her ear.
The Spider Demon blinked, extended a fair, tender finger, from which a slit opened, and blood actively flowed into the collection equipment.
"In that case, I'll trouble Miss Tamayo to complete the research on the human-transformation drug as soon as possible."
Kisaragi Rin stood up to bid farewell. Seeing this, Tamayo looked at Yushiro, "Please, Mr. Yushiro, see Mr. Kisaragi Rin out."
Yushiro naturally obeyed Tamayo's command, but as soon as he led Kisaragi Rin out of the room, he immediately revealed his true nature.
"You are not allowed to approach Lady Tamayo."
Yushiro equally disliked any man who came into contact with Tamayo, especially someone like Kisaragi Rin, who clearly seemed to bring big trouble.
If it weren't for Tamayo's request, he would never have been willing to come to a place like the Demon Slayer Corps.
"You like Tamayo, don't you?"
Facing Yushiro's hostility, Kisaragi Rin was unfazed, and with just one sentence, he broke his composure.
Yushiro's face instantly turned red and steamed, too shy to speak.
"Why are you blushing like a bubble tea pot?"
This guy's appearance was even more pathetic than a defeated female lead. Being pure was fine, but Kisaragi Rin knew Yushiro was already 35 years old.
Pure, middle-aged, and green hair—these three labels on the same man were somewhat unappealing.
However, his potential was strong, and his ability was also special.
"Want to know how to pursue Miss Tamayo?" Kisaragi Rin asked him in a seductive tone.
"You can help me?"
After subconsciously asking back, Yushiro immediately sobered up, looking at Kisaragi Rin with a wary gaze.
"I can't help directly, but I do have some methods to help you pursue Tamayo."
Kisaragi Rin casually uttered this sentence, like a flash of lightning across Yushiro's mind.
"More than love, she wants to use her life to eliminate the Demon King, which is why she has never responded to your obvious affection."
"Do you know what to do?"
Yushiro carefully considered Kisaragi Rin's words, and combining them with the actual situation, he came to a conclusion that greatly surprised him: "You mean, as long as I kill the Demon King, Tamayo will be willing to be with me!"
"No, what kind of strength do you have to come up with such a conclusion? Are you planning to die early and restart your next life with Tamayo?"
Kisaragi Rin was speechless, not expecting Yushiro to have such a thought process.
Yushiro's face flushed, and he angrily questioned, "Then what's the point of saying all this! Who can kill the Demon King!"
But then he noticed Kisaragi Rin and the Spider Demon in his arms staring straight at him.
"You mean, you'll do it?"
Yushiro understood Kisaragi Rin's meaning, and after a moment of silence, he looked up and met Kisaragi Rin's gaze.
"You didn't say all this just to give me good news, did you…?"
"What do you want, Kisaragi Rin?"
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