The Secret of the Yin Seal

A little earlier, in a tavern in the city,

Shuichi and Kurenai brought Karin back to the Land of Fire. As planned, they did not return directly to Konoha. In order to obtain the Yin Seal, they specifically sought out Tsunade's location, where they successfully "bumped into" a fat sheep who had just lost a lot of money.

To be precise, the operation was entirely led by Shuichi himself, with the other two simply following along.

"Why are you looking for me again? You're so young, yet you like to run around everywhere."

Tsunade was halfway through her drink when Shuichi appeared right in front of her without any attempt to hide it, and she couldn't help but make a sarcastic remark.

It wasn't until Shuichi gestured for the two girls, one big and one small, to sit across the table that Karin's striking red hair immediately caught her attention. "Is this... a descendant of the Uzumaki Clan? Where did you find her?"

"This child and her mother ended up in Kusagakure, and I only found out about it by chance." Shuichi slowly sat down next to Kurenai.

"They possess a magical ability: others can gain chakra to rapidly heal their injuries by biting their flesh."

Her mother died from overexertion, so I took Karin from that village.

"Of course, this was also her own wish."

Tsunade paused, her eyes fixed on the little girl. "Karin... your only love? That's a nice name."

"I seem to vaguely remember this ability. My grandmother, Mito, once mentioned the special power of her clan. It seems she really is a survivor of the Uzumaki Clan."

"But that shouldn't be a reason for you, Lord Purple Aurora, to make a special trip..." Tsunade's expression returned to its indifferent state, "And it's even less likely that you came specifically to pay for my drinks. So, tell me, what exactly is your purpose?"

"Ahem... I wouldn't dare call myself 'sir' in front of you, senior. You flatter me," Shuichi said politely, not bothering to beat around the bush.

"I've come today to ask you about the Yin Seal on behalf of Hong. Considering the value of this secret technique, I'm willing to agree to any reasonable request in exchange."

"Shuichi..." Kurenai turned to look at him in surprise, not expecting that this mission was for her sake.

"Oh?" Tsunade raised an eyebrow, propped her chin on her hand, and leaned forward, asking with a gossipy air, "I just noticed you two are sitting so close together, could it be that there's something going on...?"

Shuichi made no attempt to hide it. "You don't need to guess. We got engaged last year."

"Ah... Congratulations to you both, Kurenai and Shuichi!" Shizune exclaimed in delight. "You two look so perfect together! Remember to let me and Lady Tsunade know if you get married!"

"Congratulations..."

Tsunade instinctively wanted to offer her congratulations, but she quickly realized that Shuichi was simply showing off his affection in front of everyone.

As a middle-aged single woman, I was suddenly bombarded with a mouthful of dog food (a Chinese slang term for witnessing public displays of affection). I should never have been so foolish as to ask that question.

A thought flickered in her mind, and Tsunade suddenly smiled slyly, "Is that so...? That's certainly something to celebrate. But the preciousness of the Yin Seal goes without saying. Are you sure you'll agree to all the conditions I've proposed?"

This seemingly upright but actually naughty boy has actually developed a romantic relationship with Hong. Concern can cloud judgment, and she finally has the chance to vent her anger. Making this genius suffer is definitely going to be very interesting.

"Of course! Please feel free to ask if you need anything." Shuichi was unaware that Tsunade was already plotting against him, and he couldn't help but feel pleased when she agreed.

Tsunade said casually, "You said it yourself, the first condition... help me pay off some of my debts from the past two years, you should be quite wealthy anyway."

"Lady Tsunade! This isn't right..." Shizune's expression suddenly changed, and she secretly tugged at Tsunade's sleeve. "The amount is just too much."

"It's nothing, just give me the IOU." Shuichi was very generous.

"Okay, here you go..."

He took a large pile of miscellaneous papers and quickly tallied the total amount. "Over thirty million taels. Your luck is still as bad as ever. No problem, I'll pay it off for you soon."

"They actually underestimated your wealth!"

Tsunade in amazement. "Kurenai, this guy has quite a bit of hidden money. You'd better keep a close eye on him from now on; men with money tend to go bad."

Then she glanced at Karin, who was cowering inside, and said, "My second condition is to give this child to me. There's no one in the village more suitable to teach her than me."

Shuichi somewhat surprised, but he quickly realized that women are natural-born actresses; Tsunade must have been tempted when Tsunade heard about Karin's abilities.

This may be due to reasons related to Uzumaki Mito, or perhaps the discovery that this girl was extremely suitable to inherit his mantle.

"Hmm... If Karin has no objections, I won't object," Shuichi's thought.

He had originally planned to study the principles behind this self-healing ability, but what Tsunade said was also true.

With Haku already a disciple in the family, and Karin and Shuichi's lineages being completely different, it wouldn't be easy to arrange for him to be brought back to Konoha.

"You don't need to look so regretful," Tsunade said with a hint of disdain. "It would be a waste to hand Karin over to you. The Third Hokage doesn't have time to fully dedicate himself to training her."

"On the contrary, you'll actually benefit greatly by having her with me. Once she's matured, I'll send her to Konoha."

"Without having to put in any effort, I directly obtained a powerful Medical Ninja. What more could I ask for?"

Shuichi: "..."

That seems to be true. It takes considerable effort and resources for Konoha to nurture a young girl, and it's even more difficult for outsiders to integrate.

When Karin becomes a ninja proficient in sensory perception and medical skills and then goes to Konoha, her abilities combined with her status as a successor of the Legendary Sannin will definitely make the village treat her like a treasure.

"Alright, I agree to all your conditions." Shuichi calmly looked over. "Then about the Yin Seal..."

"Hehe, I can totally dictate it to you right now, after all, you're a big spender!" Tsunade laughed happily.

"However, I've really forgotten quite a few details after all this time. Actually, it would be better if you went back to the village and asked the Third Hokage elders. So, are you sure you want me to just tell you directly?"

Shuichi: "??"

Seeing him staring in disbelief, Tsunade on the table, practically spitting out saliva, and exclaimed, "Hahaha... The Yin Seal is already recorded in the Scroll of Seals. With your status, the Third Hokage wouldn't refuse."

"Let me guess, the Ninjutsu he's taught you over the years covers elements like escape techniques, sensory abilities, and Genjutsu, which is almost perfect for someone like you who focuses on combat."

"At the same time, your chakra reserves are astonishing; no matter how many battles you fight continuously, you will never run out of Oil Lamp. Naturally, the Yin Seal wouldn't mention it to you."

"I just didn't expect you to come all the way here to ask me about it..."

Shuichi was unusually confused. "Isn't this technique only suitable for women to practice? And if it can store a large amount of chakra, why didn't the Third Hokage practice it himself?"

"Who told you only women can practice this technique?" Tsunade replied with a smile, "Oh, I vaguely remember, most of the ninjas who use this technique are indeed women."

Because outstanding Medical Ninjas are extremely rare to begin with, let alone male Medical Ninjas who are beyond the norm, there have been very few from the Warring States Period to the present...

"..."

After Tsunade's detailed explanation, Shuichi finally understood the problem with the Yin Seal.

This technique can indeed store a large amount of chakra and replenish it instantly after it is released.

However, the reason why few people cultivate this is that the chakra that can be stored for a long time is not the ordinary original version, but chakra that has completed the Yang Release Nature Transformation.

"I see!"

A flash of insight struck Shuichi: he was still influenced by the original work and had developed a cognitive bias, failing to grasp the causal relationship of this technique.

Every ninja possesses stored chakra, but the shelf life of "original" chakra varies from person to person. However, even the most powerful ninja cannot preserve their chakra for years.

Perhaps the Six Paths family at the top of the food chain are an exception; Shuichi himself hasn't reached that level, so we won't make an assessment for now.

However, after the nature of Yang Release Nature Transformation, it can be partially achieved when combined with Fuinjutsu, but there will definitely be a certain percentage of loss involved.

It also cannot be preserved permanently.

Take Tsunade as an example; her own storage capacity has already reached its limit.

The Yin Seal actually loses Yang Release Chakra every moment, but the amount lost is very small.

After accumulating a sealed inventory, she only needed to replenish a small portion each day to fill it up, maintaining a total inventory roughly ten times her own size.

"As expected, if this technique could preserve all ordinary chakra, it would be invincible, simply impossible." Shuichi realized.

If the First Hokage could store the chakra he used for Wood Release, Madara wouldn't have needed to fight at all.

Other ninjas from the Hokage lineage would certainly not let such a "divine technique" pass them by. Even with several times more chakra on the battlefield, they would be guaranteed to win against any other Kage.

When other villages saw the Yin Seal's effect, they were amazed... The importance of the Tailed Beasts couldn't compare to this seal. The ninja battle landscape would undergo a complete transformation, and war would become a true "one-shot deal," where players would accumulate chakra at home and then launch an attack.

Shuichi quickly summarized that the Yang Release Chakra that could enter the Yin Seal could probably do a few things:

Summoning Jutsu (possibly with low chakra utilization efficiency), Nintaijutsu and taijutsu with Super Strength, Body Flicker Technique, Medical Ninjutsu, especially Mystical Palm Technique (the main purpose), Tsunade's own Forbidden Jutsu Creation Rebirth, and Hundred Healings Jutsu.

For ninjas who rely on escape techniques in combat, the chakra within the Yin Seal is simply insufficient to enhance their fighting power.

It's not just a matter of cost-effectiveness; after all, it's an S-rank support Ninjutsu, meaning even if someone wanted to learn it, they wouldn't be qualified to access it.

To learn this, one needs superb chakra control and mastery of high-level Fuinjutsu; to unleash its power, one can only learn Tsunade's fighting style.

Many of these are Tsunade's unique techniques. For example, only by using the Hundred Healings Jutsu can the chakra within the Yin Seal be amplified in her Super Strength, Taijutsu, and Summoning Jutsu.

Other ninjas are basically only used for medical treatments such as Healing Mystical Palm Technique.

Simply put, the original purpose of developing this technique was to allow doctors to conserve chakra when there weren't many patients, so that they could save more people when there were many wounded.

Uzumaki Mito is not considered Medical Ninja. She uses the Yin Seal to strengthen her own foundation so that she can better suppress the Nine-Tails, because she is not a Jinchuriki who grew up with Tailed Beast.

When she gets old, she will only need to replenish a small amount of chakra each day to maintain her enormous chakra reserves, completely eliminating the risk of her going berserk. Of course... she definitely cannot resort to violence.

"Did I get tricked? Damn it!" Shuichi felt extremely frustrated. "I only asked about the Yin Seal, but this blonde lady really knows how to nitpick. I'll just have to go back and figure it out myself."

As for why the Yin Seal is imprinted on the forehead—it's because the brain is the foundation of the soul and spiritual abilities, and storing them here is more suitable for a ninja to control the Yin Seal.

During processes such as synthesis and transfer, additional losses caused by chakra flow can be minimized, and these small losses accumulate into a considerable amount.

In addition, every woman has a heart that loves beauty.

It can be placed on other parts of the body, but it has the best beauty and skin-nourishing effect when placed on the forehead, since it contains so much Yang Release Chakra, which is one of the few benefits of this technique.

To put it simply, the Yin Seal is a village technique, Shuichi is capable of obtaining this large medical kit.

The Hundred Healings Jutsu, which transforms medical energy packs into combat power, is Tsunade's own trump card. Even the Third Hokage couldn't ask the ninjas for their exclusive Ninjutsu. This Slug Princess is famous Shinobi World, really has something special.

Shuichi immediately gave up his desire to pester him; continuing to ask questions would be pushing his luck. Tens of millions of taels were nothing to a magnanimous man like him.

He refused to believe he couldn't figure it out himself. Besides, Tsunade could create the Hundred Healings Jutsu; he was currently trying to master Yin-Yang Release.

Sasuke's Rinnegan can extract the Tailed Beast Chakra at once. It shouldn't be too much to ask me to store some chakra using my basic Yin-Yang Release...

Hong's expression remained unchanged after listening to their conversation, indicating that she probably knew she hadn't gotten what Shuichi wanted.

But she didn't seem to care at all. Instead, she gently took his hand under the table and said, "It's okay, Shuichi. You don't need to go to all this trouble to help me. Aren't you always protecting me?"

"Hmm..." Shuichi, then immediately relaxed, squeezed her hand, smiled and said firmly, "Yes, I will definitely not let anything happen to you."

The two seemed oblivious to their surroundings, their sweet demeanor making Shizune across the table extremely envious. Her eyes sparkled with admiration as she dreamed of experiencing a deeply memorable romance herself.

Tsunade was initially happy after teasing Shuichi, gradually lost her smile upon seeing this scene.

She herself had once shown that same expression as Hong, and now the pain of losing her lover was starting to pierce her heart again...

"Hey you two, there are other people here, don't go too far."

Tsunade gently tapped the table with her wine glass, her face slightly flushed and half-drunk, as she looked over.

Touched by the scene, she developed a strong liking for Hong, this brave and innocent girl.

So, feigning confusion, he said, "Since you helped me with my debts, let Hong stay behind for a while. I'll teach her something privately, but you're not allowed to find out anything behind my back."

"Thank you so much, Lady Tsunade!" Her Red Eyes were almost slits with happiness as she clasped her hands together and thanked him repeatedly. Shuichi almost couldn't keep up with her movements. "Don't worry, I definitely won't tell Shuichi!"

Shuichi and Tsunade: "..."

Tsunade continued sipping her drink, feeling somewhat annoyed. She wondered if she'd been tricked too. Then, something suddenly occurred to her, and her face darkened.

Shuichi wouldn't come looking for nothing. He doesn't want to go back to Konoha for the time being, and who knows when they'll meet again. As for that thing...

"You brat, running into you never ends well," Tsunade muttered indignantly, handing over a Scroll to Shuichi under his questioning gaze. "Take this back to the village, and don't come looking for me again!"

Shuichi took it and quickly opened it. It turned out to be the research results of White Zetsu Cells, with the main focus on repairing human limbs and organs. Judging from the handwriting and marks on it, it should have been recorded not long ago.

Not long after the Nine-Tails' Rampage, he had told Tsunade about the White Zetsu's corpse, and he had almost forgotten about it.

"After the darkest hour comes the dawn..." Shuichi thought to himself, having thought he had suffered a huge loss this time, but unexpectedly he made a small profit in the end.

"You've always cared about the village, haven't you?" Having received a favor, Shuichi immediately began to flatter Tsunade, showering her with compliments. "Without you in charge of the Medical Department, it's like it's lost its backbone. The whole village is longing for your return!"

"That's disgusting! Get out of here right after you finish eating!"

"... OK."

After finishing his meal, Shuichi tactfully got up to pay the bill and waited at the door for Hong to come out.

About half an hour later, the red vest had a lot more stock. Tsunade didn't care in detail about what Shuichi taught her. The Hundred Healings Jutsu was indeed somewhat useful to him, but it wasn't that important.

If he doesn't engage in direct combat with his Gundam, there really isn't an opponent who can exhaust him in battle right now...

After leaving the tavern, Shuichi and his companion decided to explore the city before returning to Konoha.

But as luck would have it, before he'd taken two steps, a familiar, deep voice, tinged with a hint of lewdness, rang in his ears, "Shuichi, you little brat, stop right there!"

Shuichi was extremely perceptive; seeing Jiraiya's confrontational expression, he immediately understood that the other party was probably referring to the novel.

He chose to use a pseudonym to post because he didn't want Hong to know that he knew so much strange and unusual adult knowledge.

Despite inwardly groaning, Shuichi remained composed and said to Kurenai, "It's Lord Jiraiya. He might have something important to discuss with me regarding the village's safety, or..."

"Okay, I'll wait for you over there. You two can finish your talk before you come back." Hong winked her big eyes at him, spoke softly, and then retreated to the street corner a short distance away to wait.

This acting... even Shuichi can't tell the difference between real and fake now...

Jiraiya may seem frivolous, but he's actually quite shrewd and worldly-wise. He noticed Shuichi and the girl holding hands and deliberately slowed his pace.

He himself was having relationship troubles, but he didn't want to ruin other people's happy relationships.

As Shuichi slowly approached, Jiraiya reverted to his usual erratic behavior, grabbing Shuichi the neck with his arm and dragging him into a dark corner by the roadside.

"Kid, your excuse is lame, isn't it? And what's with this talk about village safety!" Jiraiya squinted, his face full of ill intent.

"This girl seems very gentle and kind. Men need to be responsible and have a sense of duty. It's not good to cheat on her."

"Don't slander me like that. How could you say I've been messing around outside?" Shuichi said helplessly, "In this life... and my past life, I've only ever dated Hong. That's the truth."

"You even brought up your past life? You're really shameless, talking like it's the truth!" Jiraiya curled his lip and pulled out a book, Shuichi's first Adult Masterpiece.

"There are so many plot points here... only a seasoned writer could write them. How could a young person like you understand? Unless you specifically go to different places to gather material..."

"Heh, you've forgotten I'm a genius. I can guess these things just by imagining them," Shuichi said dismissively, then took out a booklet from his person and handed it to Jiraiya:

"Of course, the rapid success of my book is indeed related to your help, and it has also affected your income, so I feel a bit bad. Consider this free gift as an apology."