"Now!"
Seeing a momentary opening after the trio attacked, Akaza immediately used it to break free from their encirclement and charged towards Adam.
A Doctor with such terrifying healing abilities like Adam absolutely could not be allowed to live.
Soon, support from the Demon Slayer Corps would likely arrive. Today, he would probably be unable to complete his mission of killing that boy, much less kill the fully recovered Kyojuro.
So, to avoid punishment from Kibutsuji Muzan upon his return, he could either kill this defenseless Doctor first, or capture him alive and bring him back to Kibutsuji Muzan.
"Not good!"
Seeing Akaza rush towards Adam, Kyojuro and Tanjiro instantly guessed his intentions. Their expressions changed, and they turned to pursue him at their fastest speed.
Whether out of the Demon Slayer Corps swordsmen's responsibility to protect humans, or out of the life-saving grace just received, or for the future of the Demon Slayer Corps, Akaza could not be allowed to kill that miraculous Doctor.
"Since I've seen enough, it's time to end this."
Seeing Akaza charging at him, Adam spat out his sunflower seed shells and then softly said:
"I say, let there be light!"
As Adam's voice fell, the dark clouds in the sky instantly dispersed, and the Sun shone brightly upon the land.
The next second, Akaza, who had been running, suddenly stopped and then looked up in horror at the Sun after the clouds had cleared.
He couldn't understand how it had just been drizzling with overcast skies, and now, without any warning, it had suddenly ended. This defied all logic!
"I'm going to die, I'm unwilling! I haven't escaped Kibutsuji Muzan's control, I haven't reached the peak of martial arts, I still have so much, so much more."
The sunlight shone on Akaza's body. His body immediately ignited like dry straw meeting an open flame, rapidly burning up and turning into ash in the blink of an eye.
"Dead?"
Looking at the suddenly appearing Sun and Akaza, who had been instantly incinerated by the sunlight, Tanjiro and the other two were also dumbfounded.
They never expected that Upper Rank Three, whom they had fought so desperately, would meet such a dramatic end.
This was different from before. Previously, he was outsmarted by them, but now, it was purely bad luck.
If Akaza hadn't turned back to kill them just now and had fled directly into the forest, he wouldn't have been burned to death by the Sun like this.
"Doctor, are you alright?"
Seeing the terrifying Akaza completely turn to ash, Tanjiro slumped onto the ground, then quickly looked up and asked Adam.
Adam stood up and smiled:
"I'm fine, but you all don't seem too good."
After that intense battle, several of them had sustained quite a few injuries.
With a wave of his hand, warm healing magic sprinkled upon the three of them, and all their wounds healed.
"Thank you for your help, otherwise, we would have surely faced death this time."
Kyojuro, with his bright, piercing eyes, bowed deeply to Adam.
If not for Adam's healing, they might have all been killed and eaten by Upper Rank Three today. Their lives were saved by Adam.
"If it weren't for your selfless fighting, everyone on this train would have died long ago."
Adam smiled and waved his hand.
"Rengoku-san, Tanjiro, Inosuke!"
At this moment, an anxious voice came from the overturned train's rear in the distance. It was Zenitsu Agatsuma, who had woken up, carrying a box and jogging towards them.
"Zenitsu, it's good that you're alright."
Seeing that Zenitsu Agatsuma was unharmed and had brought his sister, Tanjiro immediately went to meet him and took the box containing his sister.
However, he then trembled slightly, looking at Adam with a hopeful expression.
"Doctor, do you know how to turn a demon back into a human?"
"Turn a demon back into a human?"
Adam stroked his chin, feigning contemplation, and replied:
"Well, I'll need to see her personally to be sure."
Unlike before, this time he did not intend to reveal his identity so quickly, nor did he plan to quickly revive the protagonist's deceased relatives or save the protagonist's sister to gain the protagonist's trust.
Because if he wanted to, he could revive them at any time, as long as the deceased's soul had not yet reincarnated.
This time, he intended to occasionally enter this World as an observer, to see if he could gain any new insights by observing the protagonist.
In fact, he had been pondering a question during this period.
Compared to the Worlds he understood, quickly gaining the protagonist's trust and then leveraging the protagonist to seek the strongest power in that World to enhance himself was not a problem.
However, if it was an unfamiliar World, doing so might not be ideal.
Because it was very possible to miss some important things.
Just like this demon slayer World, he learned about Breathing Techniques through the protagonist's memories and also saw the Flame Pillar, one of the Nine Pillars, and his mastery of Breathing Techniques.
If he were to directly eliminate Kibutsuji Muzan now and obtain all the Pillars' Breathing Techniques, there shouldn't be any problem.
Then, basically, the value of this World would be gone, just like the jujutsu kaisen World.
But if he didn't interfere too much, the protagonist might, in his future growth, surpass the existing Pillars and develop new things based on Breathing Techniques.
After all, he is the protagonist, so he must be enveloped by a protagonist's halo.
This way, he could gain even more.
And it wouldn't waste much time; he wouldn't need to come often, just occasionally check in and ensure the protagonist wasn't killed.
"Let's go there."
Because of Adam's miraculous healing ability just now, Tanjiro now had more hope in his heart, so he immediately pulled Adam and ran towards the nearby woods.
In the woods, with large trees blocking the Sun, he could let his sister Nezuko out.
The others, seeing this, also quickly followed.
It was daytime now, so demons could not appear, and the unconscious people on the train would not be in danger. They didn't need to stay here to protect them.
To be honest, they also held great expectations for whether Adam could turn Nezuko back into a human.
For Inosuke, Nezuko was already like a younger sister, and for Zenitsu Agatsuma, he had fallen in love with her at first sight and wanted to marry her immediately.
As the Flame Pillar, Kyojuro also approved of Nezuko's actions in protecting humans on the Mugen Train.
Similarly, from the perspective of a Pillar, if Adam could turn demons back into humans, it would definitely be good news for the Demon Slayer Corps.
Under the shade of the trees in the forest, Tanjiro placed the box down and embraced Nezuko, who, due to overusing her power earlier, had reverted to the appearance of a three-year-old child and was now sleeping to recover her strength.
Adam reached out and placed his hand on Nezuko's forehead, his mental power beginning to scan Nezuko's body.
He did not intend to completely cure Nezuko into a human without any power, but helping her fully regain her memories and sanity as a human and suppressing her demonic instincts was not a problem.