They won the Holy Grail War, but this turned out to be the Virtual Tree Universe.

Chapter 34 accelerates the plot to the final battle (recommendations and further reading are requested).
After Gyutaro's death, Danlei retrieved the blood vines that had been attached to it, and then said to Uzui Tengen...

"Tengen, notify everyone to retreat immediately. Muzan Kibutsuji will be here soon."

Fighting it here, let alone whether we can win, would mean certain death for You Guo and the people nearby!

If anyone refuses to leave, knock them unconscious and take them away. Our final battle with it must take place where we've prepared!

Uzui Tengen knew that Dan Lei was right. Although this was an opportunity to face Kibutsuji Muzan directly, rushing into it would only be suicide.

In fact, Dan Lei was quite certain that Kibutsuji Muzan, who had received information about the Blue Spider Lily and arrived near Yukata without finding anything, would definitely go on a killing spree to vent his anger.

Because unless it receives a bountiful blessing that allows it to face the sun directly, the blue spider lily is something it cannot give up.

Kibutsuji Muzan is not in the same league as other demons, and Dan Lei doesn't want to face him without being fully prepared.

Therefore, Tanjiro, who subsequently raised objections, was knocked unconscious by Dan Lei, who didn't even bother to argue with him.

Because of the timely evacuation, when Muzan Kibutsuji arrived, he could only see the Kyogoku-ya, which had been burned to the ground, and he couldn't find a single member of the Demon Slayer Corps.

The next day, Danlei received intelligence that the entire Kamiyahara region had been destroyed overnight, and no one had survived.

This tragedy silenced the rest of the Demon Slayer Corps, who silently blamed themselves.

However, Danlei didn't feel much of a difference.

It's not that Dan Lei is cold-blooded, but that he knows that unless he's willing to act as bait to lure Muzan away, the outcome won't change.

But Danlei certainly wouldn't risk his life for these strangers. After all, if he died here, it was completely unknown whether the Holy Grail could send him back to the Star Iron Universe.

With only one life by default, Danlei doesn't care if others die.

However, he still had to put on an act. After returning to the Demon Slayer Corps headquarters, Dan Lei immediately proposed a plan for a decisive battle.

Now that Muzan Kibutsuji has clearly obtained the Abundant Fate Path, Dan Lei dares not delay any longer. Once it becomes proficient in the power of the Abundant Fate Path, he might really be unable to defeat it.

At that point, Danlei will only have one option left: to hide, silently absorb the ley line magic to fill the Holy Grail, and then flee in panic.

This is truly shameful. Although the only difference between the Vidyadharas and ordinary humans is their physical fitness and the ability to have an extra cycle of reincarnation.

But this was, after all, an immortal bloodline. Although Dan Lei scoffed at the idea within his clan that one's father was an immortal descendant and inherently noble, he simply couldn't accept being driven away by a monster from a medium-sized demon planet.

Due to the Kamiyahara massacre, the Demon Slayer Corps fully accepted Danrei's plan for a decisive battle and stated that they were willing to cooperate with any force that could help them eliminate Muzan Kibutsuji.

With this guarantee, along with the blood of Gyutaro from the Vampire Vine and the words "Blue Spider Lily," Tamayo, who had been hiding and refusing to show herself, finally agreed to appear.

After learning of the importance of the Blue Spider Lily, the Demon Slayer Corps searched for it with all their might. With Dan Lei's guidance, they quickly found it at noon when the sun was at its strongest and brought it back to the Demon Slayer Corps.

With the blue spider lily, Tamayo's progress in obtaining the human-transforming medicine was greatly accelerated.

Of course, Dan Lei also took some samples of the blue spider lily and the human-transforming medicine, and memorized the information, because he always felt that these things might help with the recovery of his demonic body.

However, Dan Lei's focus during this period was not on the research of the human-transforming medicine and the blue spider lily.

While the entire Demon Slayer Corps was training for the final battle, Dan Lei was setting up a workshop on the mountain where the Demon Slayer Corps headquarters was located. Kagaya Ubuyashiki harbored intense hatred for Muzan Kibutsuji, and when Dan Lei proposed turning the entire mountain range where the Demon Slayer Corps headquarters was located into a trap targeting Muzan Kibutsuji, Kagaya agreed without understanding Dan Lei's actions.

For Kagaya Ubuyashiki, his own life or death was not important, nor was a mountain; the most important thing was that Muzan Kibutsuji was not around.

Moreover, Kagaya Ubuyashiki knew that Danrei could store some magical methods in gems, so he spent all his wealth to obtain a large number of gems and various metals for Danrei, with only one request: that Muzan Kibutsuji be killed here completely.

It has to be said that the Ubuyashiki family is really rich. Japan is a place that produces a lot of silver. Dan Lei said that if he had so much precious metal in his past life, he would wake up laughing in his dreams at night.

So, Dan Lei began directing the Demon Slayer Corps' "Hidden" members to cut down the tree.

The wisteria trees covering the mountain were seriously affecting the layout of my workshop.

Of course, these trees weren't felled for nothing. The wisteria flowers would be given to Shinobu Kocho to make poison for demons, and the trees themselves would be combined with various metals to make puppets.

Here, the knife-making village has handed over the Genichi Zero sword they had preserved to Danlei.

With Danlei's puppetry skills, replicating Yoriichi Zero is very simple; with the materials, it can be mass-produced.

This thing might not be enough to hit an Upper Moon demon, but it's definitely enough to restrain and deal with ordinary demons.

The preparation time for this decisive battle was very long, lasting more than four months.

During this period, Muzan Kibutsuji went on a killing spree outside.

In order to find Danlei, Muzan Kibutsuji transformed a large number of demons and began to indiscriminately attack humans at night, with only one goal: to force Danlei to come out.

Moreover, it had gone so far as to attack the government, which directly led to the fact that the concept of ghosts began to be known to ordinary humans.

And then, as you know, those high-ranking humans will do anything for immortality.

This directly led to infighting within the Japanese government, with some advocating for the extermination of demons while others secretly supported them.

It's fair to say that during these three months, the whole of Japan was in complete chaos, and even foreign powers took notice of the situation, with many "ghosts" being captured and taken abroad.

However, the Ubuyashiki family held back during the preparation period.

Because Tamayo provided the information that as long as Muzan Kibutsuji dies, all the demons he controls will die instantly. There is no need to worry about demons being taken abroad, causing the whole world to be filled with these monsters.

Then, after everything was ready, Kagaya Ubuyashiki took a picture, a picture of him holding a blue spider lily, with the address of the Demon Slayer Corps headquarters in the background.

This is an invitation, an invitation to Muzan Kibutsuji to die.

In this chaotic time, you can just kill any demon and let it take a few more glances at this photo before it dies; it will then inform Muzan Kibutsuji.

Muzan Kibutsuji, of course, would not refuse this "invitation".

After all, it despises the Demon Slayer Corps from the bottom of its heart and is not afraid of any so-called ambush.

Despite his words, Muzan Kibutsuji, though terrified, still summoned all the demons in Japan and headed towards the mountain where the Demon Slayer Corps headquarters was located.

(End of this chapter)