"Yin Seal: Release!"
Tsunade was absolutely right.
With so much chakra allocated to the wood clones learning the sealing techniques, Kiyoshi had less than thirty percent of his own chakra left, prompting him to decisively release the Yin Seal.
For days, with his extraordinarily rapid chakra recovery, he'd been filling the pool within the Yin Seal, accumulating a substantial amount of chakra.
It was now more than ten times his usual full capacity.
Enough for him to indulge.
"Multi Wood Clone Jutsu."
In a deserted forest.
Kiyoshi whispered the words.
With a swish, a dense growth of wood vines sprouted, forming over a hundred wood clones instantly.
"Everyone, for the sake of our wonderful future… I leave the rest to you."
He drew nearly all the chakra from the Yin Seal in one go.
Each wood clone was given twenty percent of his maximum chakra, far more than the ones left at the inn to practice the simple sealing jutsu.
This power was roughly 3 times that of Tsunade and infinitely more than Kakashi's.
This wasn't the feeble, flimsy shadow clone method that Naruto would use in the future when training as the Nine-Tails Jinchuriki.
If he wanted, Kiyoshi could create thousands of wood clones, but that wasn't necessary.
For him, the most ideal training model was to maintain a powerful and chakra rich clone.
"This is the Flying Thunder God Jutsu formula. Follow it for your training."
He carved a symbol onto a large tree, turning to address the numerous clones before him.
"Every ten minutes, we'll enter the shared training mode to consolidate and exchange our Flying Thunder God progress."
This was Kiyoshi's unique "Shared Training Mode," developed over the past two years.
His real body acted as a memory bank, allowing the clones to upload memories, experiences, and insights without dispelling.
This information would be stored, filtered, and corrected by his main body, then redistributed as filtered information to the clones.
In this way, the clones trained with unified guidance, avoiding mistakes, while he analyzed and processed the data to optimize their training further.
This method maximized efficiency and minimized chakra loss, capitalizing on Kiyoshi's advantage to achieve peak training effectiveness.
Only someone with Kiyoshi's abilities, a man who had lived two lives, wielding the Eternal Mangekyo Sharingan with overwhelming spiritual strength, could handle such an immense influx of information.
Anyone else would be exhausted after the first attempt to share and consolidate information.
Even Naruto, with his Sage Body and Nine-Tails chakra, could handle physical exhaustion in the short term but not mental fatigue. For him, conventional training would be better.
Kiyoshi developed this shared mode not only for training ninjutsu and forbidden techniques but also to aid in the development of new ones.
The wood clones became his efficient assistants.
"No problem!"
"Leave it to us!"
"Rest up, boss!"
The wood clones were full of energy, eagerly replying as they started practicing the Flying Thunder God Jutsu.
They began with the basic formula and time passed steadily as they repeatedly shared information, progressing at a surprising rate.
In less than an hour, the first stage of the Flying Thunder God was fully mastered.
"Poof!"
Kiyoshi, digesting the success data from his clones, vanished on the spot, reappearing before one of the clones with a space-time mark.
"Perfect! Now, on to mastering the second stage of the Flying Thunder God."
He was overjoyed, ordering the clones to continue.
With most ninjutsu he'd learned, Kiyoshi mastered them quickly without much effort, so he hadn't used shared mode for jutsu practice.
He mainly used the clones to study the insights and notes on secret and forbidden techniques from the Uchiha clan's archives.
This approach had already benefited him greatly, building a solid foundation over the past two years.
However, he underestimated the efficiency of this shared training mode.
---
Back at the inn.
Tsunade had returned to her room, feeling a strange mix of anxiety and impatience.
"Can that brat really pull it off?"
Gazing out into the dark night, Tsunade muttered, "It's impossible. The Flying Thunder God isn't just any jutsu; this space-time jutsu has only ever been mastered by granduncle, and Minato.
Even if Kiyoshi has a knack for it, there's no way he'd learn it so quickly."
"Besides, if he completes the training, he'll be so exhausted he won't even be able to stand."
Recalling his once mischievous hands, a blush crept across her face.
He wasn't that little kid from two years ago anymore—he'd grown up, too quickly.
In her room, Tsunade's thoughts were a storm of hope and apprehension. As his teacher, she wanted Kiyoshi to succeed, but a part of her dreaded losing their bet.
With him growing daily, he'd become irresistible. If they spent too much time alone together, she worried she'd cross the line.
"Just five more minutes."
Looking at the clock as it neared nine, she exhaled in relief. "Looks like he failed."
But then, without warning—
A kunai shot through the window.
Tsunade tensed up, her sharp gaze alert.
The next moment, a black figure blurred in, catching the kunai with the special formula.
"Kiyoshi?"
She stared, stunned, at the familiar, beaming face in front of her.
At some point, this brat had grown taller than her.
"Was that… the second stage of the Flying Thunder God?"
Though she hadn't mastered the jutsu, she knew enough about it.
The first stage involved using a fixed space-time mark for teleportation. The second stage required throwing a kunai with the formula, then instantly moving to it to attack.
The difficulty spiked tremendously between the two stages.
Yet Kiyoshi had mastered both stages in under three hours.
It was unbelievable.
"Hehe… don't compare me to others, Tsunade-nee." Kiyoshi threw his arms around her, hugging her close.
He looked into her face with eager anticipation. "No backing out on our bet now."
Looking at his radiant smile, though slightly tinged with exhaustion, Tsunade felt her heart soften.
She sighed, gently pinching his cheek. "You brat, when have I ever backed out?"
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