Seiki didn't hesitate. He immediately used the Spirit Transformation Technique to enter Naruto's body.
"Let your body memorize what I'm doing," "Naruto" said, sitting cross-legged and speaking with calm authority.
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Naruto was watching himself from a third-person view. As soon as he heard Seiki's voice, he obeyed without hesitation.
"It feels like something strange has entered my body!"
"That's Natural Energy. Sage Chakra is much more powerful than regular chakra because it's no longer merely a combination of Physical and Spiritual Energy—it incorporates Natural Energy in an absolutely balanced state."
"I kind of get it... but also kind of don't."
While Naruto was deep in thought, Seiki successfully manipulated his body into entering Sage Mode.
Upon entering Sage Mode, Seiki noticed some previously overlooked information within Naruto's body.
"This hidden chakra… is it Asura's?"
As the chakra reincarnation—or rather, vessel—of Asura, one of the Sages of Six Paths' sons, Naruto hadn't displayed many extraordinary traits.
His abundant chakra mainly came from his Uzumaki clan heritage. His Sage Mode was the result of his own perseverance combined with training using Shadow Clones.
Except for the final blessings bestowed by the Sage of Six Paths, this inheritance had offered little actual assistance to him.
After all, he was only a chakra reincarnation, not a soul reincarnation.
However, this discovery wasn't meaningless at all.
What intrigued Seiki most was the spiritual will attached to that chakra—the mighty willpower that had continued fighting across thousands of reincarnations.
Hashirama Senju could manifest his overwhelming battle presence. The spiritual will bound to Asura's chakra should be even greater than that. For my current stage, understanding their will could lead to major growth."
Carefully sensing Asura's spiritual will, Seiki imagined unleashing a wave of the King's Haki during the next great war.
After absorbing Natural Energy, Seiki refocused his mind and made Naruto's body stand up.
"In Sage Mode, all techniques—your ninjutsu, taijutsu, and genjutsu—will see massive improvements. Previously, you needed complete focus to execute [Wind Release: Rasenshuriken], but now it's easy. Which means…"
"Watch this," "Naruto" raised his right hand high with a spiraling Wind Release: Rasenshuriken and hurled it powerfully into the sky. "In this mode, you don't need such precise chakra control to perform your new techniques anymore! Plus, the Sage Art infused with Natural Energy is far stronger than its original version!"
KABOOM!
The thrown shuriken rapidly expanded midair, creating successive rings of air pressure that generated turbulent hurricanes blowing outward in all directions. It took half a minute before everything finally calmed down.
"So this is Sage Mode? Truly terrifying power!" Yamato felt awed yet slightly envious—when would his Wood Release ever reach such strength?
"Incredible! Even though it's Naruto's own body, under Senior Brother's control, it's become even stronger!" Sakura thought to herself in admiration.
Once the demonstration concluded, Seiki's fragment of soul returned to his original body. "Naruto, how did you feel?"
Naruto was thrilled. "That's incredible! No wonder it's Sage Mode!"
Seiki smiled helplessly. "I meant to ask about your sensory experience."
The smile on Naruto's face immediately froze. "Ha… haha… I didn't feel anything at all, it seems."
Sakura grabbed his shoulders and shook him. "Your senpai took the time to demonstrate for you, and you zoned out?!"
Naruto looked hurt. "I *was* trying my hardest to learn! But this is genuinely difficult!"
"I guess I'm being too demanding," Seiki shook his head. "Don't worry though; Mount Myoboku has a complete instructional system for Sage Arts. They will teach you how to sense natural energy."
"As for today's demonstration, its purpose was simply to let you naturally progress into Sage Mode once you've sensed the natural energy."
Moved by how much Seiki had done for him, Naruto nodded with gratitude. "I understand. I definitely won't disappoint you, Aniki Seiki!"
Seiki gave a slight nod before smiling. "There's nothing more for me to teach you all now. Go back—return to your own world!"
Both Sakura and Naruto felt reluctant. Although it had only been two short days, Seiki had cared for and guided them like both a teacher and an older brother, helping them grow significantly.
The very thought that they might never see Aniki Seiki again made their hearts tighten with sadness.
"There's no need to wear such gloomy expressions," Seiki said gently with a smile. "It's already rare for two worlds to meet. We should be grateful for fate's arrangement!"
Noticing the mood growing heavier, Yamato stepped forward respectfully. "Senior Seiki, thank you so much for your help. No matter what lies ahead, we'll always remember you!"
Why does this feel like you're cursing me... Seiki inwardly sighed, choosing not to dwell on it further, instead smiling as he turned toward the expendable pawn he'd developed across parallel worlds. "Alright then, let's go. It's time for me to completely seal off the Dragon Veins!"
With heavy steps, they walked toward where the altar had once stood, waving their arms enthusiastically. "Aniki Seiki, don't forget about us either!"
"I won't! Definitely not!"
Ziiii!
Just like static interference on old television sets, space twisted briefly before the four of them vanished without a trace.
Throughout this process, Seiki hadn't been idle either. While using Loulan Queen's pendant lineage to shut down the Dragon Veins Spring, he simultaneously laid an extremely complex technique form over the shattered altar remains to establish a sealing barrier.
Once the sealing process completed, the turbulent chakra around finally stabilized.
Of course, that was only on the surface.
In reality, Seiki had secretly left himself a loophole.
Just like Minato had done with the Eight Trigrams Sealing Style—who even seals something without leaving themselves an escape route these days?
"From now on, this place will be my mana-recharging base!" Satisfied, Seiki nodded approvingly. After milking the fox for so long, it was high time he switched targets.
In a certain sense, he could now instantly enter Full Sage Mode just like Hashirama Senju.
However, that would only be possible after unlocking the Yin Seal and utilizing Dragon Pulse Chakra.
"It looks like I'll also need to make some improvements to the Yin Seal," Seiki mused silently.
Once the Yin Seal got activated, there was no stopping halfway—you'd have to store up energy all over again after finishing its use.
Actually, that wouldn't have been a major issue in the past.
In run-of-the-mill fights, he could take down enemies without even tapping into the Yin Seal. And situations that required activating the Yin Seal meant tough battles where conserving chakra wasn't an option.
But not anymore. The Dragon Pulse Chakra has eliminated the need to draw on natural energy, meaning he can use Sage Mode in everyday combat.
This isn't just some watered-down One-time Sage Mode—it's Full Sage Mode, giving him a serious boost to his normal power.
To pull that off, though, he needs to be able to turn the Yin Seal on and off at will.
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