After coming back to his home, Kuroto immediately went to his study, thing is, he couldn't wait to open the scroll Tsunade gave him, and study the Yin-seal.
From just a simple glance over the scroll holder, he could see the mark of the Uzumaki Clan, meaning that the Yin-seal was undoubtedly an Uzumaki Fuinjutsu.
And it obviously need not be said that the creator of Yin-seal is some Kunoichi from the Uzumaki Clan.
After studying the engravings on the scroll holder, he put it aside and focused his attention on the scroll before him.
Studying the esoteric scroll word by word, Kuroto's expression changed with every next word… For a moment, he would frown, sometimes, he would look doubtful, then fall into contemplation, and another moment he would smile in triumph as if he solved a great problem and all…
Overall, a multitude of expressions was visible on his face in a short time as he delved into the study of Yin-seal, and before he knew it several hours passed.
"Sigh…" After reading the entire scroll, Kuroto released a tired sigh and went into deep thought.
The Yin-seal is exactly as he expected, a very high-end, probably an SSS-Rank Fuinjutsu with a very delicate sealing procedure.
Based on his knowledge, Kuroto can definitely see that the Yin-seal was designed several centuries ago, and perfected over the next few generations… This is why, almost all the problems that Yin-seal might have had at the time of its creation have been dealt with, making it a very practical and high-end Fuinjutsu with almost no hidden dangers or defects.
But that's where the problem comes from…
Precisely because the Yin-seal was perfected over generations, it has no hidden dangers or defects the difficulty of successfully mastering it has increased by several multitudes… And it is very straining for those who don't have sufficient knowledge, or chakra reserves to master it.
This further explains why there were only three known people, that being Uzumaki Mito, Senju Tsunade, and Haruno Sakura to have mastered the Yin-seal in the cannon.
Among these three people, the first two were the princesses of the noble shinobi clans, as such, they had a solid foundation and sufficient chakra reserves having inherited the genetics of the Senju and the Uzumaki Clans. Even in terms of talent, both Mito-sama and Tsunade-hime are Kunoichi standing at the peak of the shinobi world, therefore, it's not too surprising for them to have mastered the Yin-seal after hard work…
But Haruno Sakura was a different case altogether… Neither did she inherit the genetics of some noble shinobi clan, nor did she have high chakra reserves… The only thing she was good at was chakra control, and Tsunade's guidance, allowing her to somehow master the Yin seal. This truly is a big very achievement… Take Shizune, Tsunade-hime's other disciple for example… Shizune hasn't yet mastered the Yin-seal, despite being aware of its existence for years… This clearly proves that Yin-seal is not so easy to master.
Of course, all these problems are not difficult for Kuroto. He has very good chakra control, a solid foundation, and good chakra reserves… Most of all, Kuroto has a very good grasp of Fuinjutsu in general… which should allow him to master Yin-seal without too much difficulty. But even with all that, Kuroto isn't sure if he can truly master it…
Of course, even if impossible, Kuroto will still try it…
If it works, then well and good, if not, then figure out why exactly went wrong and what changes to make in it to master it.
With these intentions, after reading the complete scroll, and memorizing the hand signs, he put the scroll aside and started to seal it.
Unlike other Fuinjutsu, burning the core of the Yin-seal is a very difficult task. The Yin-seal is burned in one of the most vulnerable and sensitive parts of the human body, and to be able to successfully do so, a lot of knowledge about the human body structure is needed.
Fortunately, Kuroto has that knowledge… Not only does he understand the chakra pathway system of the human body because of the rigorous education provided by the Hyuga Clan, but he also has a lot of knowledge about all the other parts of the human body because he has been dissecting them, studying them, and creating them for years.
If the knowledge of the human body is considered, Kuroto believes he can easily rank among the top ten people in the Shinobi World, as such, he can repeatedly try to burn the Yin-seal on his body and figure out the problems through trial and error without having to worry about accidentally injuring his brain or chakra pathway system.
With that understood, he started to work on it.
He gathered the Chakra on his fingertips while simultaneously weaving the hand signs, then burned it on his forehead to insert the chakra inside the chakra pathway system and connect all the meridians in his body.
One by one, all the steps recorded in the scroll were completed without any problem.
After successfully engraving the seal on his forehead, Kuroto slowly opened his eyes and looked at himself in the mirror, and he was surprised to find a diamond mark there.
"Did I succeed in the first attempt?" Kuroto was shocked and delighted, he didn't really expect to succeed so easily.
But his happiness didn't last very long…
Looking inside his body through the Byakugan, Kuroto noticed that all the chakra meridians in his body hadn't connected with the Yin-seal.
"Why did this happen? Obviously, I connected them… but…" muttered Kuroto in doubt.
He calmed his mind and traced back the burning of the seal, and after some observation, he noticed that he didn't do anything wrong in the procedure, yet, there was a problem in the procedure that confused him, "then why?"
Confused, he retried it, but failed again…
But he wasn't one to give up so easily, and he tried again and again, but no matter how many times he performed it, the result was the same, all the chakra meridians in his body weren't being connected.
But his attempts didn't go to waste, and after a while of trial and error, he finally figured out the issue.
"The problem is the difference in the chakra pathway system between the males and females…"
Males and females obviously have some differences in their chakra pathways, and the Yin-seal he was burning is designed for the female chakra pathway system… which is why all the meridians weren't connecting with the seal.
'When she said to not get my hopes too high… I guess, she wasn't kidding…' Kuroto muttered with a sigh… Tsunade was indeed right, Yin-seal is truly designed to be a Fuinjutsu that is to be used only by women in general.
When the Yin-seal was created, the creator might have had the idea of creating it for both males and females, however, the males rarely tried using it, and as such, all the perfections that were made in it were made by females, and were made to suit the needs of females… This continued to happen for several generations, and over time, Yin-seal became a Fuinjutsu that could only be used by women.
In this way, it is nearly impossible for males to master the Yin-seal.
Since the chakra pathways of the two are different, obviously, the seal that is designed according to the chakra pathways of one gender won't work on the chakra pathway system of the other.
No wonder Tsunade gave me the scroll so easily… It seems she was quite certain that even if I had the scroll, I won't be able to master the Yin-seal.
Only now did Kuroto understand her line of thought. The deal the two of us made may seem quite fair on the surface, but in truth, it is not.
The chances of being able to master the Yin-seal are quite low for Kuroto, however, he will have to complete his end of the deal because she did 'complete' her part, she gave him the scroll, as for whether he can master it or not is not her problem.
It's just that Tsunade seems to have underestimated Kuroto's abilities and his means.
"I guess I'll have to show her that I am a tough nut to crack…" Kuroto muttered with a determined expression and delved into successfully mastering the Yin-seal at any cost.
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