Curious, Uchiha Kei opened the wooden box.
An old, slightly battered book appeared before him.
Two large characters were written on its worn cover: Yin-Yang.
After flipping through it briefly, Uchiha Kei was stunned.
As everyone knew, the chakra in the Shinobi World came from the energy of the God Tree, which drew power from the earth's veins and dispersed it throughout the world.
Ninja used special methods to absorb chakra, allowing them to perform all kinds of jutsu.
But the chakra absorbed by most ninja varied in quality, which was why some trained quickly while others progressed slowly.
This secret art, Yin-Yang Release, broke that rule. It converted chakra of Yin and Yang attributes into high-quality chakra.
In other words, chakra refined through Yin-Yang Release didn't need further refinement to become high-quality chakra!
This was ridiculously powerful!
"Ding. Unknown knowledge detected. Submit it to the system?"
"What do I get out of it?"
Uchiha Kei raised an eyebrow.
Submitting it to the system wouldn't cost him anything, but he wasn't about to give it away for nothing. He didn't make losing deals.
"To thank the host for submitting unknown knowledge, the system will correct any errors in it and allow the host to master it directly."
That was a pretty good deal.
"Submit it."
A flash of white light swept across Uchiha Kei's eyes. Like a scanner, it finished scanning Yin-Yang Release in an instant.
"Ding. Submission complete. The host has also mastered the modified Yin-Yang Release."
In an instant, Uchiha Kei felt as though something new had appeared in his mind.
He subconsciously activated Yin-Yang Release. The Yin and Yang chakra scattered around him surged into his body like a swarm of bees, then began circulating through his chakra pathways on its own.
That was right—it surged in!
After just a few breaths, Uchiha Kei felt full.
His chakra pathways even began to ache faintly from the pressure.
After all, his chakra reserves were only at a Genin's level right now. But even a Genin's reserves couldn't be filled in just a few breaths!
Yin-Yang Release was truly terrifying!
White Bone Momotao was dumbfounded.
She felt the Yin and Yang chakra rushing toward him, so how could she not understand what had happened?
He'd only skimmed through it, and now he'd learned it?
Was she dreaming?
"You... you..."
"This really is a powerful and miraculous secret art."
Uchiha Kei sighed sincerely. With Yin-Yang Release, he could rapidly increase his chakra reserves in a short time.
"Yin-Yang Release may be powerful, but for our White Bone Clan... it can't change anything."
White Bone Momotao's expression darkened.
With Yin-Yang Release bolstering them, the White Bone Clan had once been no match for great clans like the Uchiha and Senju, but they weren't a small clan like the Tanaka Clan that could be bullied at will, either.
Everything changed on a rainy night several decades ago.
The White Bone Clan had grown too quickly. Male clan members who began training in Yin-Yang Release at eight could reach the strength of a Jonin by adulthood.
That kind of growth terrified the other clans.
So, on that rainy night, more than a dozen rival clans launched a surprise attack on the White Bone Clan.
That night, nearly all the White Bone Clan's men were killed.
Only the women, who were less powerful, remained.
Uchiha Kei thought for a moment, and a bold idea came to him.
"The reason women couldn't train in Yin-Yang Release was that this secret art had some flaws. But the system helped me fix them."
"Could this mean I can pass it on to the White Bone Clan?"
With that thought, Uchiha Kei asked White Bone Momotao to bring him paper and a brush.
Though she didn't understand why, White Bone Momotao obediently did as he asked.
A moment later, a revised version of Yin-Yang Release was written out before them.
"Women couldn't train in Yin-Yang Release because there were flaws in the secret art itself."
Uchiha Kei blew on the still-wet ink. "I've revised it, so women can train in it now."
White Bone Momotao froze.
During the chaotic Warring States Period, why were people bullied and oppressed?
Because weakness was a sin!
If the White Bone Clan had the strength of great clans like the Uchiha and Senju, would this have happened to them?
Impossible!
"Benefactor, is this true?"
Holding the sheets Uchiha Kei had handed her, White Bone Momotao's hands trembled.
At that moment, she felt as if she were in a dream.
"Of course. But I have a condition, too."
Uchiha Kei tapped his finger lightly on the table, making a "tap, tap" sound.
"Please, tell me. The White Bone Clan will accept any condition. Even if you want me to serve you as a slave, I, Momotao, won't complain!"
Tears flowed down White Bone Momotao's face before she even noticed.
She was the White Bone Clan's leader and the former leader's daughter.
That rainy night, White Bone Momotao had watched her father and her clansmen die with her own eyes.
For the sake of the survivors, she had been forced to shoulder the burden of leadership at a young age.
But in the end, she was only an eighteen-year-old girl.
The increasingly heavy burden had nearly suffocated her.
After the Tanaka Clan's attempt to wipe them out today, she had already given up hope.
Then Uchiha Kei and his companions had appeared out of nowhere, and now they'd given her the revised Yin-Yang Release. The pressure weighing on her vanished in an instant.
It was no exaggeration to say that Uchiha Kei had given the White Bone Clan a new life.
And for her, that was even more true!
"The condition is simple. No matter what happens in the Shinobi World, the White Bone Clan must live in seclusion in this valley. You mustn't let the outside world know you exist."
White Bone Momotao didn't understand what her benefactor meant, but she nodded without hesitation.
After a moment's thought, Uchiha Kei gently removed the hairpin from her hair. It was a piece of verdant jade, carved with a bright peach blossom.
"Give this to me. It'll serve as a token."
White Bone Momotao froze slightly, a blush rising on her cheeks.
"Benefactor, I already told you. From now on, I'll serve you as a slave. You don't need a token..."
White Bone Momotao's face grew redder and redder. She gave him a shy, alluring glance, then turned and ran out of the room.
"Uh..."
Uchiha Kei's mouth hung open in surprise.
What had he done?
He'd only wanted a token to prove his identity.
Why did it seem like White Bone Momotao had misunderstood him?
Turning around, he saw the four little ones wearing suggestive grins, all of them looking shifty-eyed.
Uchiha Kei blushed a little, scolded them a few times, then drove them all out.
The group settled down with the White Bone Clan.
Partly, it was so he could teach Hashirama and the others Yin-Yang Release.
It was also to protect the White Bone Clan.
Uchiha Kei had a very comfortable time with the White Bone Clan.
During the day, he taught Hashirama and the others Yin-Yang Release. Whenever he had a spare moment, he subtly pointed them toward the paths they ought to take in the future.
At night, a soft, smooth body would always slip into his bed...
Uchiha Kei could swear on his life!
He hadn't done anything!
At most, he'd touched and hugged her. He'd kept his desires firmly in check and hadn't gone a step further!
Unfortunately, one day Hashirama happened to get up early and caught White Bone Momotao sneaking out of Uchiha Kei's room...
After that, things began to spiral out of control...
Before you continue