Kaguya's idea was simple.
She wanted to sacrifice the entire Ninja World to make the God Tree bear another fruit.
The Otsutsuki Clan had sent her to plant the tree for one reason above all: the Chakra Fruit.
As long as she could find a way to make another Chakra Fruit grow, nothing else mattered.
Whether she handed the later fruit over to the Otsutsuki Main Family to fulfill her mission, or devoured another Chakra Fruit to strengthen herself and fend off the pursuers the Otsutsuki Main Family sent after her, either would be a good choice for Kaguya.
As for everyone else in the Ninja World?
What did they have to do with Kaguya?
As far as Kaguya was concerned, even if every person in the Ninja World died, it wouldn't matter as long as she and Namikawa Yū were safe.
"What happens after you sacrifice everyone in the world?"
Namikawa Yū didn't blame Kaguya for her idea. He simply asked calmly, "What will you do if that still isn't enough to grow the next fruit?"
At his words, Kaguya fell silent, at a loss for a reply.
She knew the truth, too.
Given the Ninja World's current state, even sacrificing every living thing in the entire world probably wouldn't be enough to make the God Tree bear another Chakra Fruit.
Ultimately, the energy needed to grow a Chakra Fruit was simply too immense.
Using life as an offering and converting its energy into a fruit wasn't impossible, but it was certainly no easy feat.
"Let me give it a try."
Looking at the silent Kaguya, Namikawa Yū smiled. "Besides, your people from the main family won't be here anytime soon."
"Let me try first. If it doesn't work, you can try your method afterward. How does that sound?"
He wasn't in a hurry.
According to the original storyline, the Otsutsuki Main Family wouldn't arrive in the Ninja World for at least several thousand years.
That was more than enough time for him to do plenty.
He could try all sorts of things now.
If none of them worked, he could make other plans later.
Meeting Namikawa Yū's gaze, Kaguya looked confused.
As far as she knew, there were only a few ways to accelerate the God Tree's growth.
Apart from sacrificing the entire Ninja World, was there really another way?
Still, she had an instinctive trust in Namikawa Yū.
Since he was suggesting it, she was willing to let him try.
Namikawa Yū soon got started.
In this world, the Land of Ancestors had already been unified.
The threat of war was gone, and commoners across the land had received their own plots through the land distribution. Peace reigned in every corner.
A grand campaign of development began.
For five whole years, production and expansion greatly increased the amount of grain grown and traded within the Land of Ancestors.
Most importantly, Namikawa Yū officially distributed the seeds of chakra.
In the beginning, the seeds of chakra must have been distributed by the Sage of Six Paths.
According to legend, the Sage of Six Paths founded Ninshu and used chakra to connect people.
He had intended for people to understand one another. Instead, he distributed the seeds of chakra and spread the power throughout the world.
If the Sage of Six Paths could do it, then Otsutsuki Kaguya, the Progenitor of Chakra, could certainly do it as well.
But unlike the Sage of Six Paths and his ridiculous purpose, Namikawa Yū's goal in distributing the seeds of chakra had been clear from the very beginning.
He nurtured chakra through production, greatly improving the entire nation's efficiency in development.
In practice, chakra was useful in war, but it was even more effective when put to work in production.
The land was too uneven to farm properly? Use Earth Style to level it.
A drought and no water? Use Water Style.
Sick or injured? Use a little Medical Ninjutsu.
In every respect, chakra was almost all-powerful.
Whether it was used to kill or to save depended entirely on how one chose to wield it.
Now, Namikawa Yū was putting it to work in production.
In no time, people developed all kinds of ways to use chakra in production, and put them into practice.
All of this led to the same result: a huge increase in productivity.
Given the nature of an agricultural society, once productivity rose dramatically, the population began to boom.
In general, birth rates were already high in agricultural societies. The reason populations usually didn't grow much was that food and medical care held them back.
Now, chakra had driven a major leap in productivity, and the food shortage was largely resolved.
Medical care improved, too. Dedicated Medical Ninja emerged, and a variety of Medical Ninjutsu were quickly developed. The risks of difficult childbirth and infant mortality both fell.
On top of these basic improvements came two powerful advantages: the war had just ended, and the land distribution had ushered in an era of equality.
With every factor pushing in the same direction, the result was obvious.
A population boom.
In just ten years, the population of the entire Ninja World multiplied several times over.
More advanced industries continued to develop. Once productivity was sufficient, basic education gradually became available as well.
Of course, in this world, the most important part of basic education was none other than learning how to extract chakra.
After the seeds of chakra had been spread, most children growing up in the Ninja World could now extract chakra. Their natural talents varied, so some were better at it than others.
And this was exactly what Namikawa Yū had wanted.
Inside the royal palace of the Land of Ancestors.
Kaguya slowly opened her eyes.
Following Namikawa Yū, she entered a chamber deep within the palace.
As she watched, Namikawa Yū stepped forward and slowly opened a wooden box.
The next moment, Otsutsuki Kaguya's eyes widened.
"This is..."
Inside the box lay several emerald crystals.
They were beautiful, like pure gemstones—dazzling and captivating.
But in Otsutsuki Kaguya's eyes, these crystals held another significance.
"What an immense amount of chakra..."
She stood there, murmuring to herself, disbelief in her eyes.
"Where did you get these?"
She looked at Namikawa Yū and couldn't help asking.
"From hard work, of course."
Meeting Kaguya's gaze, Namikawa Yū smiled.
Where had all this chakra come from?
The answer was simple: he'd been skimming it off the top.
Mostly from his students.
By now, on Namikawa Yū's orders, academies had begun opening across the Ninja World.
Although various limitations made it impossible to include every child who was eligible, covering a million students was easy.
They were the best source of chakra.