Powerful Yin-Yang Release

Driven by curiosity, Uchiha Kei opened the wooden box.

A somewhat worn-out ancient book appeared before his eyes.

On the tattered cover, two large characters were written: "Yin-Yang."

After a rough flip through the pages, Uchiha Kei was shocked.

It was common knowledge that chakra in the Shinobi World originated from the energy of the Divine Tree, which drew power from the earth's ley lines and dispersed it throughout the world.

Ninjas were only able to unleash various ninjutsu by using special methods to absorb this chakra.

However, the quality of chakra absorbed by the vast majority of ninjas was uneven, which resulted in some people cultivating quickly while others progressed slowly.

This secret technique, Yin-Yang, broke that rule by absorbing chakra of both Yin and Yang attributes and converting them into high-quality chakra.

In other words, chakra refined through Yin-Yang Release did not require further purification to achieve high quality!

This thing was practically heaven-defying!

"Ding, unknown knowledge detected. Submit to the system?"

"What's in it for me if I submit 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 do business at a loss.

"To thank the host for submitting unknown knowledge, the system will correct errors within the knowledge and allow the host to master it directly."

That was a pretty good deal.

"Submit."

A white light flashed violently across Uchiha Kei's eyes, scanning the Yin-Yang Release in an instant like a scanner.

"Ding, submission complete. The host has mastered Yin-Yang Release (Modified)."

In an instant, Uchiha Kei felt something new added to his mind.

He subconsciously activated the Yin-Yang Release, and the Yin and Yang chakra scattered in the surroundings swarmed into his body, beginning to circulate through his meridians on their own.

That's right, it was a deluge!

Within a few breaths, Uchiha Kei felt full.

His meridians were even aching slightly from the pressure.

After all, his current chakra volume was only at the level of a genin, but even a genin's capacity shouldn't be filled in just a few breaths!

Yin-Yang Release was truly terrifying!

Beside him, White Bone Momotao was a bit dazed.

She felt the swarming Yin and Yang chakra and couldn't help but understand what had happened.

He just flipped through it roughly, and then he learned it?

This had to be a dream!

"You... you..."

"This is indeed a powerful and miraculous secret technique."

Uchiha Kei sighed with genuine emotion; with the Yin-Yang Release, his chakra volume could skyrocket in a short period of time.

"Although the Yin-Yang Release is powerful, for our White Bone Clan... it cannot change anything."

White Bone Momotao's expression dimmed.

In the past, with the support of the Yin-Yang Release, the White Bone Clan, while not comparable to major clans like the Uchiha or Senju, was not something a small clan like the Tanaka could bully at will.

Decades ago, on a rainy night, everything changed.

The White Bone Clan grew too rapidly; male clansmen who practiced the Yin-Yang Release could possess the strength of a jonin by the time they reached adulthood, starting from the age of eight.

Such growth terrified other clans.

And so, on that rainy night, over a dozen hostile clans launched a sneak attack on the White Bone Clan.

That night, the men of the White Bone Clan were wiped out.

All that remained were the women, who lacked significant strength.

Uchiha Kei pondered for a moment, and a bold idea surged into his mind.

The reason women couldn't practice the Yin-Yang Release was because the secret technique itself had flaws, but with the system's help, those flaws have been corrected.

In that case, could it be passed on to the White Bone Clan?

Thinking of this, Uchiha Kei asked White Bone Momotao to bring him paper and a brush.

Although confused, White Bone Momotao obediently complied.

A moment later, an improved version of the Yin-Yang Release appeared on the paper.

"The reason women couldn't practice the Yin-Yang Release was due to flaws in the technique itself."

Uchiha Kei blew on the wet ink. "This is my improved version; women can practice it too."

As the words fell, White Bone Momotao, who stood to the side, froze.

In the war-torn Warring States Period, what was the primary reason for being bullied and oppressed?

Weakness was the original sin!

If their White Bone Clan possessed the strength of great clans like the Uchiha or the Senju, would things like this ever happen today?

Impossible!

"Benefactor, is this true?"

Holding the paper Uchiha Kei had handed her, White Bone Momotao's hands trembled slightly.

At this moment, she felt as if she were in a dream.

"Of course it is true, but I also have conditions."

Uchiha Kei tapped his fingers lightly against the tabletop, creating a rhythmic "tap-tap" sound.

"Please, speak. The White Bone Clan will accept any condition. Even if you require me to be your slave or servant, I, Momotao, will have no complaints!"

Tears flowed unconsciously from White Bone Momotao's eyes.

She was the matriarch of the White Bone Clan and the daughter of the late patriarch.

On that rainy night, White Bone Momotao had witnessed the death of her father and her clansmen with her own eyes.

For the sake of the remaining survivors, she, still young, had been forced to shoulder the heavy burden of leadership.

But at the end of the day, she was merely an eighteen-year-old girl.

The ever-increasing weight of her responsibilities was suffocating her.

Today, with the Tanaka Clan's attempt to exterminate them, she had already fallen into despair.

The sudden arrival of Uchiha Kei and his group, combined with the improved version of the Yin-Yang Release, had caused the pressure on her to dissipate in an instant.

It could be said that for the White Bone Clan, Uchiha Kei's actions were nothing short of a rebirth.

For her personally, it was even more so!

"The condition is simple: no matter what happens in the Shinobi World, the White Bone Clan must remain in this valley, hidden from the world, and you must not let the outside world know of the White Bone Clan's existence."

White Bone Momotao did not understand her benefactor's intent, but she nodded without the slightest hesitation.

After a moment of thought, Uchiha Kei gently removed the hairpin from her hair—a piece of verdant jade carved with a vibrant peach blossom.

"Give this to me; let it serve as a token."

White Bone Momotao was slightly stunned, a flush of shyness rising to her cheeks.

"Benefactor, I already said just now that from this day forward, I am your slave and servant; there is no need for a token..."

White Bone Momotao's face grew redder and redder. She cast a charming, bashful glance at him before turning and running out of the room.

"Uh..."

Uchiha Kei's mouth hung slightly open in bewilderment.

What had he done?

He had only wanted a token to verify his identity.

Why did it feel like White Bone Momotao had misunderstood something?

Turning his head, he saw the four little ones nearby wearing ambiguous smiles, each looking as sly as a fox.

Uchiha Kei's own face flushed slightly, and after scolding them a few times, he chased them all out.

The group settled down to stay with the White Bone Clan.

On one hand, it was to teach the Yin-Yang Release to Hashirama and the others.

On the other, it was to protect the White Bone Clan.

Uchiha Kei lived quite comfortably among the White Bone Clan.

During the day, he taught Hashirama and the others the Yin-Yang Release, and in his spare time, he would subtly point out the paths they should take in the future.

At night, a smooth, soft body would always crawl into his bed...

Uchiha Kei could swear to the heavens!

He hadn't done anything!

At most, he would cuddle and hold her; he kept a firm grip on his desires and never took things a step further!

Unfortunately, after Hashirama woke up early one day and accidentally discovered White Bone Momotao sneaking out of the room...

Things began to spiral out of control.