"No Matter How Strong A Defense, A Stronger Offense Will Always Shatter It.""
— Byakuya Kuchiki, Bleach
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~ Push the Story Forward with your Power Stones
~ If you're interested, you can read up to Chapter 76+ : p@treon.com/dragonnx
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Even Nezuko and Mitsuri were stunned by the sight of Muzan frozen solid.
When they recovered from their shock, they looked at Roy with admiration.
Roy smirked, a hint of pride in his eyes.
The Icy 9-Dragons was a magnificent and powerful technique.
It was one of the stronger techniques that Satellizer L Bridget possessed, though Roy could only unleash a fraction of its full potential.
Even so, it was more than enough to instantly kill Muzan Kibutsuji. Any living being caught in this attack would be utterly destroyed.
However, Roy didn't kill Muzan outright. He merely froze him solid.
"Muzan Kibutsuji," Roy chuckled, "how would you like to die?"
"You can't kill me!" Muzan declared, his voice filled with manic confidence in his near-absolute regenerative abilities.
"Oh? Is that so? Then would you like to experience the feeling of being exposed to sunlight?" Roy taunted.
Muzan's face paled with fear.
If there was one thing that could truly kill him, it was sunlight.
Muzan was speechless.
"It's a shame, though," Roy continued with a sly smile. "After you die, your subordinates, the Upper Ranks and the others, might just choose a new Demon King."
Roy's intention was simple. eliminating Muzan wouldn't solve the Demon problem quickly.
The Twelve Kizuki still remained, and the Upper Ranks were beyond the capabilities of the Demon Slayer Corps.
And Roy and his group would eventually leave this world.
That's why he deliberately angered Muzan with those words.
He wanted Muzan to eliminate all the other Demons himself.
As the progenitor of Demons, Muzan could use his bloodline curse to kill any Demon.
As expected, Muzan's eyes burned with killing intent upon hearing Roy's words.
With his ruthless, selfish, and egotistical nature, he would never allow the Upper Ranks, whom he considered mere tools, to become the new Demon King.
Now that he had no escape, he would drag all Demons down with him.
Muzan activated his bloodline curse.
Outside Asakusa, Saeko and the others had just slain a few Upper Ranks and were about to deal with the remaining Demons.
Suddenly, all the hundreds of Demons present collapsed, their bodies turning to ash and fading away.
Not only that, but almost every Demon in existence, except for those who had broken free from Muzan's control, perished at that moment.
"What's going on?"
"Is Muzan Kibutsuji dead?"
Saeko and the others exchanged surprised glances, then returned to Roy's side.
They marveled at the massive ice sculpture that held Muzan, their eyes filled with admiration for Roy.
"Is Muzan Kibutsuji dead?" Shinobu asked, peering at the frozen figure.
"Not yet. We'll let him die slowly," Roy replied.
He instructed Gyomei Himejima and the other Hashira to guard the ice sculpture.
They then retired to a nearby residence arranged by the Demon Slayer Corps.
Roy wasn't worried about Muzan escaping.
Unless the ice was exposed to direct sunlight for ten days or half a month, it wouldn't melt.
When the sun rose, Muzan would be reduced to ashes. Roy would let him savor the anticipation of his demise.
That night, Kagaya Ubuyashiki also arrived.
Despite his frail health, he had decided to come after hearing that Muzan had been captured and the other Demons had perished.
He wanted to witness Muzan's end.
As the first rays of dawn broke through the horizon, Muzan Kibutsuji finally turned to ash and vanished from existence.
The Demon Slayers breathed a collective sigh of relief.
"On behalf of the entire Demon Slayer Corps, we thank you, Roy-san!" Kagaya declared, leading the Hashira and the other Demon Slayers in a deep bow of gratitude.
"Haha, there's no need for thanks. It was purely a transaction," Roy replied.
With his mission accomplished, Roy relinquished his position as the leader of the Demon Slayer Corps.
"Now that Muzan Kibutsuji has been dealt with, it's time for us to depart."
With a wave of his hand, Roy summoned an ice-blue magic circle beneath their feet.
In an instant, they vanished.
"He really is an extraordinary individual," Amane Ubuyashiki remarked, watching them disappear.
"Yes. Thanks to him, the Demon Slayer Corps was able to eliminate Muzan Kibutsuji and countless other Demons with minimal casualties," Kagaya said, deeply grateful to Roy.
...
Roy and his group reappeared in the Butterfly Mansion.
He decided to stay at the Butterfly Mansion for a while instead of immediately returning to Kuoh Academy.
He instructed the Kocho sisters to teach Tanjiro medical skills.
He wanted to look after his brother-in-law, especially since he was about to take Nezuko away.
Before leaving, he wanted to ensure Tanjiro's future. He didn't have such concerns for the other girls.
Over the next month, Roy spent his time practicing Satellizer L Bridget's techniques, Breathing Styles, and spending time with the girls.
Within that month, Tanjiro grasped the basics of medicine.
However, a month wasn't enough to become proficient.
But he could now handle simple illnesses and injuries.
It was time for Roy to return to the world of 'High School DxD'.
"Tanjiro, it's time for us to go," Roy said, patting Tanjiro's shoulder.
"Roy-nii-san... Nezuko..." Tanjiro's eyes welled up with tears.
"Onii-chan, you're a grown-up now. Why are you still so teary-eyed?" Nezuko scolded, putting her hands on her hips, though her own eyes were also a bit red.
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Also a total of 8 fanfics available!