A corner of the Infinity Castle.
Rengoku Shinjuro, wielding his nichirin blade, was clearing away the demons charging from all directions.
After an unknown length of time, the number of demons began to gradually decrease. Seizing a moment to catch his breath, Rengoku Shinjuro looked back at the figure behind him.
"Master, are you unharmed?"
"Do not worry about me, Shinjuro."
Ubuyashiki Kagaya's complexion was somewhat pale.
Due to the curse upon him, his physical condition was very poor.
Moving about in an environment like the Infinity Castle was no small burden for him.
"Just hold on a little longer. It will... soon be over." Rengoku Shinjuro looked into the distance.
It had been nearly forty minutes since he and Ubuyashiki Kagaya had fallen into the Infinity Castle.
During this process, violent explosions and flames had once erupted in the distance, followed later by very conspicuous fireworks.
After Ubuyashiki Kagaya's explanation, he understood the meaning of these signals.
Now that Nakime was under control, the initiative had shifted from the demons' side to the Demon Slayer Corps.
If everything was truly as Ubuyashiki Kagaya said, then this battle would soon be ov...
*Duang~!*
A clear *biwa* note rang out.
Rengoku Shinjuro instinctively tensed, grabbing Ubuyashiki Kagaya's arm.
However, contrary to his expectations, this time the surrounding architecture did not change, and neither he nor Ubuyashiki Kagaya were teleported.
The only change was the appearance of a *shoji* door on the ground not far ahead.
"This is..."
As if thinking of something, Rengoku Shinjuro looked at Ubuyashiki Kagaya beside him.
"Let's go, Shinjuro."
Ubuyashiki Kagaya took a deep breath.
If Nakime were in her normal state, she would never open a door in this manner.
Carrying a sliver of anticipation in his heart, Ubuyashiki Kagaya and Rengoku Shinjuro stepped through the *shoji* door.
In the next instant, the scenery around them shifted, and they returned to the Ubuyashiki Residence.
It was late at night. The sky was cloudless, and the bright moonlight spilled into the courtyard.
Under Ubuyashiki Kagaya's watchful gaze, Lynn appeared, followed by Kocho Shinobu and the others.
Seeing that no one was missing, Ubuyashiki Kagaya, who had been holding his breath, finally relaxed. His gaze fell upon Kibutsuji Muzan at Lynn's feet.
"Care to take a few swings?"
Lynn raised his nichirin blade. "I can enchant it for you. Don't worry about not being able to cut him."
"No need. Send him on his way directly."
Ubuyashiki Kagaya shook his head slightly.
For him, it was enough to witness the moment of Muzan's death with his own eyes.
"What about you all? Care for a few swings?"
Seeing Ubuyashiki Kagaya's lack of interest, Lynn looked towards Tamayo, Kocho Shinobu, and the others.
Everyone standing here bore some grudge, more or less, against Kibutsuji Muzan.
For those like Tamayo and the Kocho sisters, he was the reason their families had been destroyed.
If anyone wished to personally send Muzan off, he didn't mind enchanting their weapon with the Ripple.
"I'd like to, but after becoming a demon, I can't casually touch that ability of yours, right?"
Kocho Shinobu set down her case of marbles. "Let's not complicate things. You do it directly."
"Alright, then I will."
Hearing Kocho Shinobu's reminder, Lynn also realized the others couldn't casually come into contact with the Ripple.
With that in mind, he delayed no longer. Raising his nichirin blade, he swung it at Muzan.
In an instant, the blade covered in golden lightning pierced through Muzan's chest. Vast Ripple energy flowed through the wound into Muzan's body.
Attacked by the Ripple, Muzan, who had been in a comatose state, suddenly opened his eyes wide, let out a scream, and briefly regained consciousness.
But before he could utter a word, starting from the point of the wound, Muzan's body began to disintegrate.
A few seconds later, under the gaze of the Demon Slayer Corps members, the Demon King who had wreaked havoc for over a thousand years, causing countless casualties, turned to black ash and dissipated into the air.
"And that's the end of that."
Lynn sheathed his nichirin blade.
Every demon converted by Muzan was implanted with a bloodline curse.
Now that Muzan was dead, affected by this bloodline curse, the other demons would vanish along with him.
The only ones who would survive were Tamayo, who had broken free from the bloodline curse, and the Demon Slayer Corps members she had converted.
"Cough! Cough! Cough!"
At that moment, Ubuyashiki Kagaya suddenly began coughing, covering his mouth.
"Master!" Himejima Gyomei rushed over immediately to check on him.
"Do not worry. I am fine."
Ubuyashiki Kagaya wiped the blood from the corner of his mouth, a touch of color returning to his face.
After Muzan's death, he could feel something that had been pressing down on his bloodline vanish.
As if breaking free from a cage, Ubuyashiki Kagaya felt vitality and life force for the first time in a long while.
"The bloodline curse... is finally lifted."
Ubuyashiki Kagaya let out a long sigh.
Looking at the black-haired youth not far away, he leaned forward slightly and bowed to him.
"Lynn, on behalf of the Ubuyashiki Clan and all members of the Demon Slayer Corps, I extend our gratitude to you."
"This kindness, I will remember forever. If you ever need assistance, you can come to me at any time."
"Since you put it that way, I won't stand on ceremony." Lynn accepted the thanks with a clear conscience. "I need the connections of the Ubuyashiki Clan to help me gather medicinal ingredients."
"Medicinal ingredients?"
"Yes, ingredients for making the evolution potion."
Although he had obtained the formula for the demon king potion from Kibutsuji Muzan's mouth, that didn't mean it was over.
To create the complete demon king potion, a large quantity of rare and precious medicinal ingredients was required.
Especially the blue spider lily. Although Lynn knew it was near the Kamado family's place, finding the Kamado family itself was no simple task.
Without borrowing the power of the Ubuyashiki Clan, relying on him alone, it would be difficult to collect enough ingredients in a short time.
Lynn looked at Ubuyashiki Kagaya: "If the materials are sufficient, I can make a few extra evolution potions to give to you."
"The evolution potion won't be necessary. I will help you search for the materials."
Ubuyashiki Kagaya shook his head, declining Lynn's goodwill.
As the head of the Ubuyashiki family, he understood perfectly well what the evolution potion represented.
Something this dangerous—the less of it, the better. After all, not everyone was as cowardly and foolish as Muzan.
If the evolution potion fell into the hands of dangerous elements, the consequences would be unthinkable.
Thinking of this, Ubuyashiki Kagaya suddenly had an idea.
"Lynn, after you take the evolution potion, I plan to send people to eliminate environments where the blue spider lily might grow. What do you think?"
"Up to you, as long as it doesn't affect my share of the evolution potion."
Lynn nodded in agreement without hesitation.
For him, as long as he obtained the demon king potion to strengthen the power of this 'Lynn' collective, it would already count as completing the task.
As for after that, if Ubuyashiki Kagaya wanted to not just eradicate the blue spider lily, but even wipe out the Japanese imperial family, he would support it with both hands.
After a brief exchange with Ubuyashiki Kagaya to confirm the next steps, this post-war meeting concerning Muzan came to an end.
Accompanied by Kocho Shinobu and Kocho Kanae, the three of them set off on the road to the Butterfly Mansion.
Moonlight spilled down, a cool breeze gently blowing.
Kocho Shinobu walked on the bluestone brick path, her eyes flickering with thought, as if pondering something.
After an unknown amount of time had passed, she turned her head to look at the black-haired youth walking beside her.
"Lynn, after you finish making and taking the evolution potion, is there anything else you want to do?"
"Hmm... help you two complete your imperfections. Otherwise, you won't be able to move about in sunlight."
"And after that?"
Kocho Kanae also joined the inquiry.
Her purple eyes met Lynn's gaze, a trace of curiosity appearing on Kocho Kanae's face.
"After we complete our imperfections and can also walk in sunlight, what do you plan to do?"
"No concrete plans for now. Might overthrow the Japanese imperial family and become the boss."
"Huh? Is that a joke?"
"You can take it as a joke."
Lynn shrugged and let out a light laugh.
Although it was a parallel world, barring any unforeseen accidents, history after the Taisho era would enter a sensitive point in time.
Considering the situation of DanMachi Lynn, the last thing he could do to help was collect a deed.
Of course, all of this would be after taking the evolution potion. As for before that...
Looking at the Kocho sisters standing beside him, he raised both hands, offering one to each.
"Want to become my women?"
"Hey! What kind of weird thing are you suddenly saying!"
A blush appeared on Kocho Shinobu's face.
Her thoughts, which had been pondering Lynn's earlier outrageous statement, were instantly diverted by this new declaration.
"It's the Taisho era now! Even if you get married, you can only have one wife!"
"So, what!"
Lynn declared righteously, "I've fought battles all my life, can't I enjoy myself a little now?!"
"This..."
Kocho Shinobu was momentarily speechless.
The words were crude, but the reasoning wasn't. There wasn't anything wrong with what Lynn said.
Unsure what to say for a moment, Kocho Shinobu looked at her sister.
"Sister! Say something too!"
"I have no problem with it."
"Huh?"
"What's wrong?" Kocho Kanae tilted her head. "Do you dislike Lynn?"
"Well, no, not that."
"Then there's nothing to hesitate about."
Kocho Kanae revealed a gentle smile.
Compared to the shy Kocho Shinobu, she didn't have much of a reaction to Lynn's words.
Not only was he handsome, but he also possessed miraculously skilled culinary abilities—practically perfect.
Besides these, Lynn had also helped treat Kanao's psychological issues and killed Kibutsuji Muzan, completing her revenge. These were all bonus points.
All these factors combined meant that Kocho Kanae's impression of Lynn was not only not bad, but she actually held a very high level of favor towards him.
"If you agree, Shinobu, we can continue living together. There's nothing bad about the three of us living together, right?"
"The three of us together..."
Kocho Shinobu was somewhat persuaded by her sister.
After losing their parents, she and Kocho Kanae had relied on each other, growing up together.
Her earlier hesitation was because Lynn's invitation involved Kocho Kanae.
Since Kocho Kanae had no problem with it...
Looking at Lynn's outstretched hands before her, she slowly raised her own hands and grasped them.
...