After lunch, hearing that Tsunade planned to start teaching Minato how to train immediately, Jiraiya and Orochimaru left together.
For a shinobi, training involves their own personal intel, and intel is tied to a shinobi's safety; therefore, it is a very private matter.
Unless the relationship is very close, disturbing someone else's training is actually an extremely impolite act.
Even seven-year-old Nawaki understood this.
After greeting Tsunade following the meal, he went off to find his friends to play.
Tsunade then took Minato back home, rummaged around, and pulled out several scrolls as thick as tree trunks.
She piled them in front of Minato like she was stocking up for the New Year.
"Are these all Wood Release Ninjutsu?"
Minato looked at the stack of scrolls, which was quite a bit taller than himself, and his eye twitched slightly.
"No, it's more accurate to say they are the legacy Ninjutsu of the Senju Clan."
"It's not just Wood Release."
"I remember you said before that you've already tested your chakra nature."
"So, I assume you must have some understanding of certain chakra characteristics?"
Tsunade looked at Minato, her gaze carrying a hint of testing him.
"If we're talking about characteristics... chakra possesses uniqueness, heritability, and sociality."
"Uniqueness means that everyone's chakra characteristics are different."
"Heritability refers to bloodline inheritance; children usually inherit the chakra natures of their parents or ancestors."
Minato thought for a moment and continued.
"Sociality means that the nature of chakra in people from different regions varies greatly, which may be influenced by social factors or environmental factors."
"Not bad."
Tsunade nodded, expressing satisfaction with Minato's solid theoretical foundation.
"Just as you said, chakra possesses heritability."
"Therefore, the chakra natures of the Senju Clan are mostly the two attributes of Water and Earth."
"As for Wood Release... how much do you know about Kekkei Genkai?"
"Not much, I only know it was the First Hokage's bloodline."
Minato shook his head.
Chakra characteristics were essential knowledge learned at the beginning of chakra training, and they were recorded in the scrolls his father left behind.
But there was nothing on Kekkei Genkai; that wasn't something he was supposed to understand yet.
"Listen up."
"Chakra is energy refined from a one-to-one mix of a person's physical energy and spiritual energy."
"Ninjutsu, on the other hand, is an effect produced after chakra undergoes different formal changes through hand seals."
As Tsunade spoke, she held up two fingers.
"Generally speaking, the forms of change for chakra can be divided into two types: one is Shape Transformation, and the other is Nature Transformation."
"Training in Shape Transformation can enhance control over chakra."
"Training in Nature Transformation can enhance the power of Ninjutsu of the corresponding attribute."
"And a Kekkei Genkai is a power derived from the fusion of two types of Chakra Nature Transformation."
"For example, your Wood Release is a mixture of Water and Earth Chakra Nature Transformations."
Minato raised his hand.
"Then, Tsunade-sensei, does this mean I innately master two types of Chakra Nature Transformation?"
"Yes, but not entirely."
Tsunade shook her head with a smile.
"The true difficulty of a Kekkei Genkai lies in simultaneously performing two types of Chakra Nature Transformation and fusing them."
"For instance, Water nature in the left hand and Earth nature in the right."
"For those born with a Kekkei Genkai, this ability is like a biological instinct."
"They are born with a certain foundation in Nature Transformation and the ability to fuse two types of nature."
"But this doesn't mean they don't need to train in Nature Transformation."
"In fact, because a Kekkei Genkai is a mixture of two chakra natures, they actually have one more nature to train than others."
As she spoke, perhaps worried about dampening Minato's enthusiasm, Tsunade added another point.
"Of course, the power of a Kekkei Genkai is definitely much stronger than single-attribute techniques."
"Moreover, even without a Kekkei Genkai, to become a qualified Jonin, one must at least master two types of Chakra Nature Transformation."
"If someone with a Kekkei Genkai is born with the ability to release two Chakra Nature Transformations simultaneously..."
Minato thought for a moment.
"Then can I use this as a basis to synthesize even more Kekkei Genkai?"
"Theoretically it's possible, but wait until you've mastered one Chakra Nature Transformation first."
Tsunade chuckled and patted the scrolls beside her.
"Among these scrolls, the white ones record the training methods for Chakra Shape and Nature Transformation."
"Yellow is Earth Release Ninjutsu, blue is Water Release, and green is Wood Release."
"These are all things you will learn in the future. I plan to start teaching you from the basics."
Minato tilted his head.
"Training in Shape and Nature Transformation?"
"It's chakra control!"
Tsunade rolled her eyes.
"In terms of the sequence of training, Shape Transformation generally comes before Nature Transformation."
"But that's something only addressed at the Chunin level at the earliest. For you right now..."
Tsunade paused, leaped up, flipped through the air, and landed hanging upside down from the ceiling.
Her smile carried a hint of pride.
"This is your next training goal~ Don't think that just because you've learned the Shadow Clone, you're all set."
Hearing this, Minato looked up at Tsunade.
"Actually, I've already learned how to walk on water."
Hearing those words, the smile on Tsunade's face instantly froze.
"You learned it?"
"Yes."
Minato nodded.
"It was recorded in the training scrolls my father left behind. It wasn't very difficult."
Tsunade silently jumped down from the ceiling.
"Well... chakra control isn't exactly beyond the curriculum. How long did it take you to master it?"
"Ten minutes."
"Pfft..."
Tsunade laughed out of sheer frustration.
"Creatures like geniuses are truly unreasonable..."
She had taken about ten minutes herself back then, but she had already graduated from the Academy by then, whereas Minato hadn't even enrolled yet...
"In that case, let's start the training for Shape Transformation..."
"Shape Transformation is an extension of chakra control; there aren't any very specific training methods."
Tsunade sighed, her tone a bit dull.
"Internal training can increase proficiency by continuously refining chakra and controlling its flow through the body."
"External release can increase proficiency by attaching chakra to the body's surface and constructing different forms."
Minato watched Tsunade silently; he felt like Tsunade was starting to slack off.
And his feeling was correct.
Tsunade was indeed slacking off... because she suddenly realized that aside from combat experience, she had nothing left to teach him!
Climbing trees and walking on water, Minato already knew.
As for Chakra Nature Transformation, which only Jonin master, because of his bloodline, he innately possessed the foundation for two... or even multiple Chakra Nature Transformations.
As for Chakra Shape Transformation, judging by the speed at which Minato learned to walk on water, it probably wouldn't take long for him to reach a quite respectable level.
But that was the standard setup for the Jonin in the village!
Some Jonin hadn't even mastered a second chakra nature...
What made Tsunade feel most terrified was that once Minato completed this training, it meant he would have already surpassed her in terms of raw strength!
If she were 30 and Minato were 15, she could accept it.
On the contrary, she might even be happy for her genius disciple.
But if she was 19 and Minato was 5, then her psychological defense was truly starting to crumble...