Feeling the dense chakra energy within the unique space created by All-Encompassing Sealing Technique, Seimei didn't hesitate. He immediately manipulated the seal to connect it with his Byakugan.
In the next moment, the chakra within the space underwent a secondary refinement and compression through the seal, becoming even more concentrated before flowing into his Byakugan.
Although a significant amount of chakra was lost during this process, the process itself served to strengthen his Byakugan.
Because of this, Seimei ignored the chakra that dissipated and instead focused on sensing the changes in his eyes.
Time passed, minute by minute.
Roughly two and a half hours later, he finally opened his eyes.
At this point, the 400,000 chakra points he had accumulated throughout the day were completely depleted.
His Byakugan's evolution level, however, had increased by four points.
Looking at the progress panel, where the evolution level had risen from (110/1000) to (114/1000), Seimei nodded in satisfaction.
After that, he stood up, went inside the wooden cabin to wash up briefly, and then went straight to sleep.
While his condition today wasn't as bad as on the day of his extreme testing, it wasn't much better either.
Although the final step—stimulating his Byakugan's evolution with chakra—hadn't drained much of his mental energy, the strain on his mind was undeniable.
Because of this, after completing all of his training for the day, he felt slightly more exhausted than he had initially expected.
Still, it was within his limits.
That said, a good night's rest was necessary.
And so, the night passed without incident.
---
### The Next Day
At dawn, as the sky began to brighten, Seimei woke up.
His routine remained the same—wash up, eat, extract chakra from the Seven-Tails, and then begin his training.
The training process mirrored the previous day's exactly.
First, he performed the Multi-Shadow Clone Jutsu, creating dozens of clones.
Then, he assigned them specific training tasks according to his plan.
After that, he recalled the clones every hour to absorb their experiences and update their status before continuing the cycle.
This loop repeated until nightfall.
After a short rest to relax his mind, Seimei once again activated All-Encompassing Sealing Technique, linking it to his Byakugan.
What followed was a familiar process—using the chakra accumulated throughout the day to fuel his Byakugan's evolution.
Two and a half hours later, when he had nearly reached his limit, the chakra in the alternate space was completely depleted, and the Byakugan's evolution process halted.
With that, another day of training was complete.
For the next several days, Seimei repeated this routine like a machine executing a perfectly programmed set of commands—without a single deviation.
---
### Five Days Later
That morning, Seimei dispelled his Multi-Shadow Clone Jutsu once again, absorbing all the experiences and memories from his clones.
At that moment, his All-Encompassing Sealing Technique finally leveled up.
It had risen from Level 7 to Level 8.
Seimei carefully analyzed the changes and felt that his understanding of the sealing technique had taken another step forward.
Without hesitation, he halted his training.
Standing up, he retrieved the metal sphere containing the sealed Seven-Tails and used Chakra Absorption Technique to extract another 500,000 chakra points.
Since this extraction happened sooner than usual, the Seven-Tails was in a significantly worse state than before.
And that was precisely Seimei's intention.
After glancing at the weakened Seven-Tails, he placed the metal sphere aside and walked into his wooden cabin, retrieving a blank scroll that had been prepared in advance.
Returning to the small training ground near the giant boulder, Seimei unrolled the scroll on the ground.
Taking out a brush and ink, he began drawing and writing on the parchment.
Since he had already done this twice before, it didn't take long for him to inscribe the All-Encompassing Sealing Technique into the scroll in the form of a sealing formula.
That's right—upon reaching Level 8, Seimei had created an updated version of the sealing scroll.
This scroll wasn't meant for anything else—it was specifically prepared to reseal the Seven-Tails.
Even though the current seal was still incredibly stable with no signs of weakening, there was an old saying: Better safe than sorry.
Now that his All-Encompassing Sealing Technique had improved, allowing him to create a more refined and secure seal, there was no reason not to upgrade.
And this wouldn't be the last time.
Once the technique reached Level 9, and eventually Level 10—the S-rank mastery level—he planned to repeat this exact process.
After all, Seimei was an extremely cautious person.
With that thought in mind, he turned his attention back to the newly inscribed scroll.
Compared to the Level 7 version, the sealing formula on the scroll had actually become simpler, not more complex.
But Seimei wasn't surprised by this at all.
This wasn't unique to sealing techniques—most high-level skills tended to become more refined and efficient as mastery increased.
For example, his other S-rank jutsu—the Flying Thunder God Technique!
Back when he first learned the technique, placing a chakra marker required inscribing an intricate and elaborate formula.
But now, it was reduced to a simple symbol.
It was clear that once he reached Level 10 (0/0), he would likely be able to use any arbitrary symbol or even just a line of text as a teleportation marker—just like Tobirama Senju and Minato Namikaze.
These thoughts flickered through his mind, but Seimei quickly dismissed them.
Focusing again, he activated his Mangekyō Sharingan.
Then, picking up the metal sphere, he deactivated the All-Encompassing Sealing Technique on it.
Instantly, the alternate dimension within the sphere collapsed, and the Seven-Tails was forcibly expelled into the real world.
Feeling the open air around it, the massive beast was momentarily stunned.
Just moments ago, it had been internally cursing Seimei for constantly siphoning its chakra, yet now, out of nowhere, it was free.
It almost didn't feel real.
But whether real or not, it had to act.
Without wasting a second, the Seven-Tails prepared to unleash all of its chakra and flap its wings at full power to escape as fast as possible.
As for fighting Seimei?
Sure, it loathed him for imprisoning it and draining its chakra every day, but at least it had enough self-awareness to know it was no match for him.
So running away was the priority!
Unfortunately, having just had its chakra drained, the Seven-Tails was in a severely weakened state.
This prevented it from releasing its full power immediately.
And that delay gave Seimei the opening he needed.
The moment the beast materialized, Seimei appeared right in front of it.
The instant their eyes met, he activated his Mangekyō Sharingan and cast Genjutsu: Sharingan!
In a mere instant, the Seven-Tails' consciousness was pulled into an illusionary realm.
At the same time, Seimei could even sense the unwillingness in the beast's heart.
But that didn't matter.
Without wasting any motion, he grabbed the metal sphere, placed it in the center of the newly drawn sealing array, and injected chakra to activate the All-Encompassing Sealing Technique inscribed on the scroll.
As before, the intricate sealing patterns lifted off the parchment and embedded themselves into the metal sphere, opening up a new alternate dimension inside.
And just like that, the Seven-Tails was sealed away once more.
This time, with an even stronger seal.
As for the Seven-Tails' reaction upon realizing it was back in captivity—well, Seimei couldn't care less.
With the beast secured, it was now time for his own upgrade.
Since he was refreshing the seal for the Seven-Tails, it only made sense to update the space within his own body as well.
But before that, he needed to deplete the chakra stored inside.
With that decision made, Seimei once again performed the Multi-Shadow Clone Jutsu, summoning dozens of clones to begin a new cycle of training.