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One thousand years ago, Kibutsuji Muzan was born as a stillborn baby. Relying on his powerful obsession, he managed to survive.
Unfortunately, due to his poor Innate constitution, he was diagnosed with a life expectancy of no more than twenty years.
Later, he met a kind-hearted Doctor. To extend his life, the Doctor developed a very special medicine for him.
However, after taking it, he found that his health did not improve. In a fit of rage, he actually killed the Doctor.
But after some time, his body suddenly recovered, and he possessed power as great as a god's.
The only flaw was that he could not face the Sun.
He would not allow himself, as powerful as a god, to have such a weakness, so he began to study the Doctor's prescription.
He attempted to find a way to compensate for his weakness from the prescription.
After years of research, he discovered that the main ingredient in the prescription came from a magical flower called the blue spider lily.
As long as he could find this magical flower, he would have hope of being free from the limitations of sunlight.
Unfortunately, he searched for over a thousand years. Even with so many demons developed to help him search, he still could not find the existence of the blue spider lily.
And now, he no longer had the chance to transform into the perfect creature, because he was going to die—to die at the hands of the terrifying boy before him.
He was unwilling; he was so unwilling!
"Kamehameha!"
Goku ignored Kibutsuji Muzan's resentment. With a push of both hands, the terrifying Energy Wave completely enveloped the immobilized Kibutsuji Muzan.
As the Energy Wave dissipated, Kibutsuji Muzan also completely vanished from this World.
At the same time, except for the three demons—Nezuko, Tamayo, and Yushiro, whom Tamayo created—who had long since been free from Kibutsuji Muzan's control,
all other demons in the World, just like Kibutsuji Muzan, were annihilated from this World.
And this scene was witnessed by the Nine Pillars and all the swordsmen who had just arrived.
When they discovered that the Seven Upper Moons had vanished instantly, the Nine Pillars realized something was wrong.
They knew it must have been that demon capable of using spatial Blood Demon Art who had teleported the Seven Upper Moons to besiege Goku.
So they immediately slew all the remaining demons and began searching for traces of Goku and those Upper Moons within the Demon City.
But after searching for several hours and scouring the entire Demon City, they found no trace of them.
Until just now, hearing the massive commotion generated here, they rushed over in a hurry.
By the time they arrived, they happened to see Goku sending Kibutsuji Muzan to Hell with a Kamehameha.
"Kibutsuji Muzan is... dead?"
The Nine Pillars asked Goku in disbelief.
Goku nodded and then handed several crystal bottles to Tanjiro: "This is the blood of the Seven Upper Moons and Kibutsuji Muzan that I collected. I hope it can help you."
"Thank you, thank you so much, Goku."
Tanjiro took the eight crystal bottles, his face filled with excitement.
With this blood, Young Miss Tamayo could research a potion to turn demons back into humans, and his sister Nezuko would be saved.
And when the others saw Goku produce the blood of all the Upper Moons and Kibutsuji Muzan, they truly realized that Goku had indeed killed the Seven Upper Moons and Kibutsuji Muzan all by himself.
"He's just too strong!"
One must know that before those Seven Upper Moon demons were moved, the Nine Pillars had almost no power to fight back when facing them.
They could only barely hold their ground.
But Goku alone had killed the Seven Upper Moons and Kibutsuji Muzan, which meant Goku's individual strength far exceeded the combined power of the Nine Pillars.
Immediately after, many swordsmen began to weep with joy, including the Nine Pillars.
In this final decisive battle against the demons, not only did not a single person die, but they also won the ultimate victory.
Now that evil demons would never appear in this World again, they could live normal lives from now on.
Those grudges could finally be laid to rest.
And all of this was thanks to the boy named Goku before them.
His appearance saved the entire Demon Slayer Corps and the World.
One month later, at the Demon Slayer Corps Headquarters.
"No matter how many times I thank you, it will never be enough to express my gratitude."
Ubuyashiki Kagaya, whose curse had been completely lifted due to Kibutsuji Muzan's Death, sat across from Goku with a face full of emotion.
"This is a small token of my appreciation; I hope it can help with your training."
He handed Goku a book titled "Information Regarding Marks, Bright Red Nichirin Swords, and the Transparent World."
Now that Kibutsuji Muzan was dead, there was no longer a need for the Demon Slayer Corps to exist.
So he had disbanded the Demon Slayer Corps and arranged for all the swordsmen to have the lives they desired.
During this time, the Nine Pillars also kept their promise and sparred with Goku, guiding him to learn each of their respective Breathing Technique.
To show their gratitude, all the other swordsmen also taught their Breathing Technique to Goku.
Among them, the most powerful was Tanjiro's Sun Breathing, which he realized from the dance his father performed in his memories.
It is said to have originated from the first Breathing Technique swordsman, Yoriichi Tsugikuni—the swordsman who nearly slew Kibutsuji Muzan.
By combining all these Breathing Technique, Goku also created and perfected his own Ki Breathing, with a total of ten forms.
Seeing how much Goku loved training, Ubuyashiki Kagaya compiled the most important information he had gathered regarding Breathing Technique into a volume and gave it to him.
Although this information did not contain specific training methods, it provided some insights that might be useful for Goku's training.
"Thank you! I'm going to continue my path of training. I'll come back to visit you all when I have time!"
Goku tucked the book away, waved to Ubuyashiki Kagaya, and then leaned against the wall, closed his eyes, and vanished from the spot.
Seeing this, Ubuyashiki Kagaya sighed once more, "You must be a deity sent by the heavens to save us!"
In the white space, Goku pushed open the fourth door, which had "Fairy Tail" written on it.
There was less than two years left until the next World Martial Arts Tournament. He wondered how many experts would gather at Papaya Island then.
So he had to continue entering New Worlds and working hard on his training, striving to win the championship when the time came.
In an alley in Magnolia Town, Kingdom of Fiore, Earth-land,
Goku's figure slowly appeared.
"I'll ask if there are any powerful experts nearby to spar with."
Walking out of the alley and looking at the bustling streets, which were in a completely different style from the previous Worlds, Goku didn't mind. Instead, he asked a few people nearby who were playing cards, "Uncle, do you know who the strongest person around here is?"
After leaving Mount Paozu, he had seen too many things he couldn't understand: flying iron birds, fast-running iron boxes, and small capsules that could turn into houses.
So, entering a New World and seeing different scenery did not make him curious like an ordinary person.
Nor would he focus his attention on such things.
What he always cared about was whether there were powerful experts in the New World to spar with, whether he could learn and realize new Moves, and whether he could improve his strength.
Therefore, the first thing he did upon entering a New World was naturally to look for nearby experts.