After Gyutaro died, Dan Lei retrieved the Blood Vine that had originally been attached to him, then said to Tengen Uzui,
" Tengen, notify everyone to retreat immediately. Kibutsuji Muzan will arrive soon.
If we fight him here, setting aside whether we can win, the Entertainment District and everyone nearby will be doomed!
If anyone refuses to leave, knock them out and carry them away. Our final battle with him must take place where we have prepared!"
Tengen Uzui knew Dan Lei was right. Although this was an opportunity to face Kibutsuji Muzan directly, confronting him in haste would only mean throwing their lives away.
In fact, Dan Lei was certain that after receiving the information about the Blue Spider Lily and finding nothing near the Entertainment District, Kibutsuji Muzan would go on a killing spree to vent his frustration.
Because unless he had received the Blessing of Abundance and could already face the sun, the Blue Spider Lily was something he could never give up on.
Kibutsuji Muzan and the other demons were on entirely different levels. Dan Lei had no intention of facing him without making absolutely certain preparations.
Thus, when Tanjiro later objected, Dan Lei knocked him unconscious outright, not even wanting to waste time arguing with him.
Because they had retreated in time, when Kibutsuji Muzan arrived, he could only see the already burned-flat Kyogoku House. He could not find a single member of the Demon Slayer Corps.
The next day, Dan Lei received word that the entire Kamishichiken area had been destroyed overnight, with not a single survivor.
The tragedy left the other members of the Demon Slayer Corps silent, secretly blaming themselves.
Dan Lei, however, did not feel much.
This did not mean Dan Lei was cold-blooded. He simply knew that unless he was willing to act as bait and lure Kibutsuji Muzan away, the outcome would not change.
But Dan Lei certainly would not risk his life for a group of strangers. If he died here, whether the Holy Grail could send him back to the Star Rail Universe was completely unknown.
Assuming he had only one life, Dan Lei could not care less whether others lived or died.
Still, he had to put on an act. After returning to the Demon Slayer Corps Headquarters, Dan Lei immediately proposed a plan for the final battle.
Now that Kibutsuji Muzan had clearly obtained the Abundance Destiny, Dan Lei no longer dared to delay. Once Muzan became proficient with the power of the Abundance Destiny, Dan Lei might truly be unable to defeat him.
By then, Dan Lei would have only one option left: hide, silently absorb the magical power of the Ley Lines until the Holy Grail was full, and flee in disgrace.
That would be far too humiliating. Although the Sustainer Dragon Clan was only physically superior to ordinary humans and possessed one additional reincarnation talent, this was still an immortal bloodline.
Dan Lei sneered at the clan's belief that being a descendant of Permanence made them inherently noble, but he simply could not accept being driven away by an abomination from a middle-magic planet.
Because of the Kamishichiken tragedy, the Demon Slayer Corps accepted Dan Lei's final battle plan in its entirety. They also stated that as long as Kibutsuji Muzan could be eliminated, they were willing to cooperate with any force possible.
With that guarantee, along with Gyutaro's blood from the Blood Vine and the words "Blue Spider Lily," Tamayo, who had hidden herself and refused to reveal herself, finally agreed to appear.
After learning how important the Blue Spider Lily was, the Demon Slayer Corps searched for it with all their strength. Following Dan Lei's hint, they soon found it at noon, when the sun was at its fiercest, and brought it back to the Demon Slayer Corps.
With the Blue Spider Lily, Tamayo's Demon Transformation Medicine made tremendous progress.
Of course, Dan Lei also took samples of the Blue Spider Lily and the Demon Transformation Medicine, and firmly memorized the relevant information. He had a feeling that these things might be useful for restoring a Mara-struck.
However, Dan Lei's focus during this period was not on researching the Demon Transformation Medicine or the Blue Spider Lily.
While the entire Demon Slayer Corps underwent special training for the final battle, Dan Lei set up a workshop on the mountain where the Demon Slayer Corps Headquarters was located.
Kagaya Ubuyashiki's hatred for Kibutsuji Muzan was incredibly deep. When Dan Lei said he intended to turn the entire mountain range containing the Demon Slayer Corps Headquarters into a trap aimed at Kibutsuji Muzan, Kagaya agreed immediately despite not understanding Dan Lei's methods at all.
To Kagaya Ubuyashiki, his own life and death were completely unimportant. A mountain was unimportant too. Nothing mattered more than Kibutsuji Muzan.
Moreover, Kagaya Ubuyashiki knew that Dan Lei could store miraculous methods inside gemstones. Thus, he spent the entire family fortune obtaining a massive quantity of gemstones and various metals for Dan Lei. He had only one demand: Kibutsuji Muzan had to be killed here, once and for all.
It had to be said that the Ubuyashiki Family was truly wealthy. Japan also produced silver in abundance. Dan Lei remarked that if he had possessed this much precious metal in his previous life, he would have laughed in his sleep.
Thus, Dan Lei began directing the Demon Slayer Corps' Kakushi to cut down trees.
The mountainside was covered in Wisteria flower trees, and they seriously interfered with the construction of his workshop.
Of course, the trees were not being cut down for nothing. Shinobu Kocho would use the Wisteria flowers to make poison targeting demons, while Dan Lei would combine the wood with various metals to create puppets.
By then, the Swordsmith Village had already handed over the Yoriichi Type Zero they had preserved to Dan Lei.
With Dan Lei's magic automaton technology, replicating the Yoriichi Type Zero was extremely simple. As long as he had the materials, he could mass-produce them.
These things might not be enough to fight an Upper Rank, but they were certainly sufficient for restraining and dealing with ordinary demons.
The preparations for this final battle took a long time—over four full months.
During this period, Kibutsuji Muzan could only be described as having gone on a killing spree outside.
To find Dan Lei, Kibutsuji Muzan transformed a large number of demons and began launching indiscriminate attacks on humans at night. He had only one goal: to force Dan Lei out.
He had even become so crazed that he planned to attack the government, directly causing the existence of demons to become known to ordinary humans.
Then you know what happened. For the sake of immortality, those human elites were willing to do anything.
This directly caused infighting within the Japanese government. Some wanted to eliminate the demons, while others secretly supported them.
It could be said that during those three months, all of Japan had been thrown into chaos. Even foreign forces took notice, and quite a few demons were captured and taken abroad.
However, the Ubuyashiki Family held firm throughout the preparations.
Tamayo had provided them with information: as soon as Kibutsuji Muzan died, every demon under his control would die instantly as well. There was no need to worry about demons being taken overseas and causing these monsters to spread across the world.
Then, once everything was ready, Kagaya Ubuyashiki took a photograph—a picture of himself holding the Blue Spider Lily, with the address of the Demon Slayer Corps Headquarters behind him.
It was an invitation, a death notice inviting Kibutsuji Muzan to come and die.
During this chaotic period, they only needed to find a demon, kill it, and let it look at the photograph a few extra times before its death. It would then go and notify Kibutsuji Muzan.
And when Kibutsuji Muzan saw this "invitation," he naturally would not refuse.
After all, he looked down on the Demon Slayer Corps from the bottom of his heart and was not afraid of any so-called ambush.
But despite his words, the cowardly Kibutsuji Muzan still gathered every demon in Japan and surrounded the mountain where the Demon Slayer Corps Headquarters was located.
Before you continue