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From the moment Hachiman Hikigaya revealed the title's effect, Kisaragi Rin had already begun planning, which was thoroughly refined through the experiences of these past few days.
Exposing Spider Mother, a demon unafraid of sunlight, forced Kibutsuji Muzan to personally intervene.
Finding Tamayo and obtaining the four medicines, while also persuading Yushiro to cooperate fully.
Kisaragi Rin and Spider Mother, currently before him, attracted Kibutsuji Muzan's attention.
The four Pillars, as the overt combat strength, dispersed the remaining Upper Ranks.
Then, Yukinoshita Yukino, Yushiro, and Mitsuri Kanroji secretly dealt with Nakime, causing the Infinity Castle to fall, completely depriving Kibutsuji Muzan of any chance to retreat.
Enmu's ability took away Kokushibo, who possessed the Transparent World, allowing Hachiman Hikigaya to walk unimpeded behind Kibutsuji Muzan using invisibility.
The final blow!
That's why Kisaragi Rin said it didn't matter to give the Upper Rank head to Yukinoshita Yukino, because without her, Kisaragi Rin could only arrange for Mitsuri Kanroji to deal with Nakime, which would also mean missing out on Nakime's treasure chest.
"Don't kill me, I'm willing to become your follower!"
Kibutsuji Muzan, held by Kisaragi Rin, uttered an ancient, pleading voice.
Kisaragi Rin looked at Kibutsuji Muzan with some surprise, not expecting this guy to even know about something like a follower.
Seeing Kisaragi Rin hesitate, Kibutsuji Muzan was somewhat secretly pleased and continued to raise his stakes: "My aptitude is quite rare and excellent. A year ago, there was someone like you who wanted me to become a follower. With my abilities, I'm far more valuable than being killed!"
"Then why are you still here?"
Kisaragi Rin showed no expression. A player appearing in the demon's camp, and Kibutsuji Muzan even arranging for Kokushibo and Doma to raid the Demon Slayer Corps headquarters, it didn't look like an ordinary player no matter how he looked at it.
"That's because of the flaw in my bloodline!"
"He told me that my bloodline's issue must be resolved in this world. If I were to leave this world, the cost would be even more unbearable, which is why I stayed here."
Kibutsuji Muzan looked at Spider Mother beside Kisaragi Rin and said in a seductive tone: "But you are different. You currently have a way to resolve my bloodline's issue. As long as my bloodline's flaw is resolved, I can leave with you immediately!"
[Kibutsuji Muzan's favorability towards you has reached maximum.]
[You have unlocked Kibutsuji Muzan's Destiny Mission.]
[Destiny Mission: Resolve Kibutsuji Muzan's fear of sunlight.]
The Paradise's prompt followed, and the instant maxed-out favorability was, of course, not love, but Kibutsuji Muzan's distorted desire for survival.
Hachiman Hikigaya and Spider Mother quietly waited aside, awaiting Kisaragi Rin's choice.
Kisaragi Rin merely soothingly stroked Spider Mother's head, and the Golden Light Technique completely enveloped Kibutsuji Muzan.
"Rather than having a thousand-year-old thing that can be male or female stay by my side, I'd rather you get some sun. The only reason you're still alive is because I need to kill the other Upper Ranks first."
Just by looking at the Paradise's prompt, it was clear that the other player hadn't told Kibutsuji Muzan the whole truth.
Without resolving Kibutsuji Muzan's flaw, there was no way to bring him out as a follower.
During their conversation, Kisaragi Rin had already arrived at Doma's battlefield. Although the three Pillars were somewhat battered, no lives had been lost yet.
Spider Mother released Enmu's Blood Demon Art from her eyes. Doma paused for a moment, then quickly committed suicide to leave the dream.
What came into view again was Kisaragi Rin's close-range Demon Hunter, like a hot knife through butter, Doma's head was already severed.
[You have killed Upper Rank Two - Doma.]
[You have obtained Upper Rank Two - Doma's treasure chest.]
[Your mission - Twelve Kizuki completion has increased.]
Next battlefield!
Hantengu's Blood Demon Art was the most numerous and varied, and the battlefield had completely crumbled.
Busujima was stepping on Hantengu's main body, the Cowardly Demon, awaiting Kisaragi Rin's arrival.
[You have killed Upper Rank Four - Hantengu.]
[You have obtained Upper Rank Four - Hantengu's treasure chest.]
[Your mission - Twelve Kizuki completion has increased.]
The next battlefield, Gyokko, was the head prepared for Hachiman Hikigaya. After cutting through Gyokko's tough outer skin, Hachiman Hikigaya killed him.
Since all Upper Ranks were dead, Kisaragi Rin looked at Kibutsuji Muzan.
"As long as I recover, I can become very beautiful, I can change into any form..."
Still trying to beg for mercy, but halfway through his words, Kibutsuji Muzan looked at the indifferent Kisaragi Rin and fell silent, suppressing his fear, and looked up at Kisaragi Rin.
"He will avenge me..."
[You have killed Kibutsuji Muzan.]
[You have obtained Kibutsuji Muzan's treasure chest.]
[Your mission - Millennium Demon King has been completed.]
Putting Kibutsuji Muzan's corpse into the Workshop, Kisaragi Rin sighed.
"I already said, when I find him, I'm going to beat the crap out of him."
...
The moment Kibutsuji Muzan died, all the demons affected by him also died.
"Is this what he meant by 'unrivaled'? So it really was literal..."
Shinobu Kocho looked at the dark night in a daze, not expecting it to end like this.
The Millennium Demon King had died in the hands of Kisaragi Rin, who had only learned Breathing Styles two days ago.
Sanemi Shinazugawa and Kyojuro Rengoku still felt it was unreal, while Giyu Tomioka still stood alone.
The Kasugai Crow that survived in the Infinity Castle also scattered in all directions. Now they had to find the Demon Slayer Corps to report the good news.
Spider Mother quietly accompanied Kisaragi Rin to deal with the aftermath. After killing Kibutsuji Muzan and putting him into the Workshop, Kisaragi Rin discovered that the clothes on him were actually a piece of equipment.
Equipment - Demonic Garment
Description: Like a Demon King descended from heaven, truly a god of calamity on earth!
Effect 1 - Transformation: Can freely change into the style of other clothes.
Effect 2 - Demon King: Can store and control demons and supernatural beings within the Demonic Garment.
Effect 3 - Calamity God: The controlled demons and supernatural beings will bring special luck to the user.
Bonus: Charm +1
Usage Condition: Constitution 20, completed a massacre of ten thousand people.
Kisaragi Rin looked at this piece of equipment with some confusion, never expecting to just pick up such a top-tier item.
"Could it be a love token given to Kibutsuji Muzan by that player?"
Kisaragi Rin thought, somewhat slandering.
No matter whose it was, it was Kisaragi Rin's once it was in his hands.
Although he didn't quite understand what "special luck" meant, the overt effects of Demon King and Calamity God already perfectly fit his development path.
The transformation effect also allowed him to keep it equipped at all times, rather than it sitting in a corner gathering dust like a hood, only to be used when that vague luck was needed.
The only issue was that the current usage conditions hadn't been met yet; Constitution needed to be at least 20 points.
However, once all rewards were claimed, his panel attributes would likely experience another major surge, easily meeting the usage conditions then.
Yukinoshita Yukino and Hachiman Hikigaya returned the treasure chests dropped by the Upper Ranks as agreed.
Kisaragi Rin now had six treasure chests waiting for him to open.
His box-opening soul could no longer endure.
But for now, Kisaragi Rin still had to figure out where the Infinity Castle had fallen.
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