Adam's current idea was that perhaps he could learn the unique breathing techniques of this World to fully control his physical strength, and then find a way to go to the Dragon Ball World to meet an Angel and learn Ultra Instinct.
The power of an Angel and a God of Destruction, just the energy fluctuations from their full power, could cause the entire Universe to tremble, risking collapse; accidentally sneezing twice could shatter two Planets, certainly exceeding the single-Universe level.
And above them, the Omni-King, with just a thought, could casually erase any Universe, placing him above the Multiverse level.
Therefore, he couldn't obtain the Training method for Ultra Instinct through brute force; he still needed to display sufficient strength and potential to be chosen to learn Ultra Instinct.
"Let's go take a look first, don't let the protagonist get killed."
Adam thought for a moment, then activated his Dream Walking Technique, traveling to the demon slayer World through Primordial Space.
Tanjiro had, after all, only joined the Demon Slayer Corps for a short time, so to learn more about the origin of breathing techniques, he still needed to ask others.
"Even if you fight me with the resolve to sacrifice your life, it's meaningless, Kyojuro.
Humans cannot defeat demons; the wounds your exquisite sword skills leave on me can heal in the blink of an eye, but what about you? Your left eye is destroyed, ribs shattered, internal organs severely damaged—these are irreparable, critical injuries.
If you were to become a demon like me, these injuries would heal instantly, and you would possess endless longevity to continue improving yourself."
Upper Rank Three Akaza, looking at the heavily injured but unyielding Flame Pillar Kyojuro opposite him, earnestly advised him.
He had killed many Pillars, but powerful ones like Kyojuro were rare.
As a martial arts fanatic, he truly hoped that the other party could become a demon and continue fighting alongside him.
However, after hearing Akaza's words, Kyojuro's resolve not only didn't waver but became even stronger.
A powerful aura emanated from him, and the potential unleashed by Flame Breathing made him seem enveloped by endless Fire.
"I will fulfill my responsibilities and duties as a Nine Pillar; I will never let any human here die, and I will definitely cut off your head!"
Wielding his nichirin blade, Kyojuro used every last bit of strength in his body and charged towards Akaza.
"I am the Flame Pillar, Rengoku Kyojuro, Flame Breathing · Ninth Form · Rengoku!"
"Hahaha, as expected of an enemy I acknowledge! Come on, Destructive Kill · Annihilation Style!"
Akaza, seeing this, met him with an excited look.
The two clashed again, sword glint and fist Shadow, stirring up a whirlwind, and even the ground suffered large-scale collapses from the aftermath of their battle.
Tanjiro, not far away, wanted to help, but he was severely injured from his previous battle with Lower Rank One Enmu, making it difficult even to stand up.
And Inosuke, beside him, was frozen in place, unable to move, awestruck by the terrifying battle that far exceeded his imagination.
"Is this the Pillar-level application of breathing techniques? To be able to control one's body to this extent, excellent, excellent!"
Just then, Tanjiro suddenly heard an unfamiliar voice beside him; he turned his head and saw that, at some unknown point, a young man in strange clothes was standing next to him.
This surprised him greatly.
Because during the previous battle with Lower Rank One Enmu, the Infinity Train had already derailed, and all the passengers should have been unconscious.
Even if they woke up, seeing the current scene, they should be scared and hide, not run over to watch.
Crucially, he hadn't even noticed when someone else had appeared beside him.
He sniffed with his nose, and his racing heart gradually calmed down; the other party wasn't a demon, he was a human, but he didn't have a weapon, so he probably wasn't a Demon Slayer Corps swordsman either.
He might just be a bold ordinary person, and he himself hadn't noticed because he was too focused on the Flame Pillar's battle.
"Sir, it's very dangerous here; please hide quickly."
Despite his deep concern for the Flame Pillar's battle, Tanjiro gently advised the young man.
He worried that the young man might be caught in the crossfire and get injured.
"Your personality... well, never mind. Do you want to go up and help?"
Adam looked at the sincere-eyed Tanjiro and asked with a hint of emotion.
He always thought that people who were too kind and gentle were not suited for brutal combat, but then he thought of Tanjiro's experiences and realized that it wasn't entirely true.
Tanjiro's personality was indeed very gentle and kind, even showing sympathy for demons who devoured humans like nothing, yet he also killed demons without hesitation, which was quite rare.
"Help?"
Tanjiro was stunned for a moment; of course he wanted to help, but his body was severely injured, and he couldn't even stand up.
Adam reached out and touched Tanjiro's body, activating his healing ability.
"I'm a very skilled Doctor. There, you're all better."
In the blink of an eye, the previously severely injured Tanjiro returned to his optimal physical condition.
"How is this possible?"
Feeling his perfectly intact body, Tanjiro's face was filled with disbelief.
However, he reacted quickly, immediately grabbing his nichirin blade and charging towards the area where the Flame Pillar and Akaza were fighting.
"Inosuke, quick, help! Dance of the Fire God · Blue Heaven!"
"Beast Breathing · Fourth Fang · Serrated Slash!"
Inosuke, roused by Tanjiro, grabbed his two serrated nichirin blades and followed closely.
With the addition of the two, the battle immediately changed.
"How can this be?"
Akaza looked at the perfectly unharmed Tanjiro, a look of surprise on his face.
He distinctly remembered that this guy, whom Lord Kibutsuji Muzan had specifically ordered to be killed, was severely injured; how did he suddenly recover?
The two demon slayers, Tanjiro and Inosuke, would normally be ants he could crush with a flick of his hand, but now, with Kyojuro's presence, they were indeed causing him some trouble.
This also forced him to significantly restrain his fighting style.
However, this also foiled Kyojuro's plan; Kyojuro had originally intended to fight with all his might, then expose a weakness and, at the cost of being impaled, trap the opponent's arm, thereby cutting off his head in one fell swoop, trading a life for a life.
But now that the opponent's attacks had become cautious, that plan was naturally no longer feasible.
"Only when the Sun appears."
At this stage, with his body severely injured and the opponent perfectly unharmed, slaying him had become impossible; he could only do his best to stall the opponent and wait for the Sun to rise, relying on the Sun's power to kill him.
"No, the Sun is coming out; I need to get to a place where the sunlight can't reach quickly."
Seeing dawn break through the darkness and the Sun about to rise, Akaza secretly thought, "This is bad," immediately abandoned his mission, and turned to rush into the forest behind him.
Even Kibutsuji Muzan couldn't withstand sunlight, so he certainly couldn't either.