"As for the Lightning Stimulation Method… I remember the Senju clan has something like that," Tsunade said slowly after observing Hoshino Yoru for a moment.
"But you're still young. Techniques like this can seriously damage your body."
"It's fine, Tsunade-nee. I have my reasons."
What Tsunade didn't know—
Was that Yoru possessed monstrous regenerative abilities.
A bit of lightning stimulation?
He could handle it without any side effects.
"…Alright."
Tsunade finally relented under Yoru's firm gaze.
"I'll get it for you later. But your first training session must be done under my supervision."
"Okay, Tsunade-nee."
Seeing the seriousness in her expression, Yoru felt a hint of warmth in his heart.
"As for strength control…"
Tsunade frowned slightly, her brows knitting as she thought.
"That involves a lot. First, you need to understand the structure of muscles and bones."
"Once you've got a basic grasp, I'll teach you."
"I'll bring you some books tomorrow. Study them properly."
…
After waiting a day—
Early the next morning, Tsunade delivered the books Yoru needed and reminded him to come find her when he started training.
Yoru looked at the Lightning Stimulation Method in his hands, a trace of excitement flashing in his eyes.
This—
Would determine how fast his strength could grow.
Strictly speaking—
The Lightning Stimulation Method wasn't really a ninjutsu.
It was a secret technique.
Anyone with Lightning Release chakra could learn it—
As long as their body could endure it.
Its principle was simple:
Use lightning to stimulate every part of the body—
Skin, muscles, bones—
Even internal organs.
Destroy—
Then regenerate—
And become stronger than before.
"…Let's try it."
A faint, dangerous smile curved on Yoru's lips.
Following the method—
He immediately began training.
One minute…
Ten minutes…
Half an hour…
Crackle—
A sharp, piercing sound suddenly rang out!
Arcs of lightning burst from Yoru's body, radiating both inside and out!
Snap! Crackle!
Though the lightning arcs were small—
Their power was immense.
As another natural disaster—
Lightning was no weaker than magma.
Yoru's skin began to split apart—
Revealing raw flesh beneath—
Electric arcs continuously surging through it.
Blood slowly seeped from his entire body.
An unbearable pain surged through him.
Yoru clenched his teeth—
And endured.
Crackle… crackle…
The lightning grew louder—
Brighter—
More violent.
The blood increased.
The pain intensified.
Yet—
If one looked closely—
His flesh was writhing, rapidly regenerating from the damage.
…
After an unknown amount of time—
Yoru slowly opened his eyes.
A flash of lightning flickered within them.
"Haa…"
He exhaled a long breath—
Sparks of electricity escaping along with it.
"This… is no joke."
Yoru looked at his battered body and let out a bitter smile.
Although his wounds had mostly healed—
The blood covering his body told the true story of what he had endured.
After all—
Not everyone possessed a monstrous physique like his.
Ordinary people would train this technique cautiously—
Fearing the devastating damage lightning could inflict.
But Yoru—
Had pushed it head-on.
After washing away the blood—
He sat cross-legged and began extracting chakra.
During the process, he made a discovery—
His physical strength and chakra growth were directly proportional.
If his chakra doubled—
His physical strength would also double.
"…About a ten percent increase."
Yoru opened his eyes, pleasantly surprised.
"The first session really has incredible results."
From now on—
He could rapidly enhance his body strength.
With his terrifying regeneration—
As long as his mental stamina held out—
He could continuously train the Lightning Stimulation Method.
…Though it consumes a lot of mental energy.
Yoru sighed inwardly.
Naturally—
Enduring that level of pain drained the mind severely.
While his body recovered quickly—
Mental exhaustion took much longer.
He decided to rest.
While tearing into the food he had taken from the academy—
He read through the books Tsunade had given him on muscle and skeletal structure.
Yoru couldn't forget—
The expression on Nakamura Hino's face when he had gone to collect a week's worth of food.
That look of shock—
Mixed with the urge to slap him on the spot.
After devouring a large amount of food—
Yoru gradually drifted into sleep.
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