Feng Zheng thought for a moment and came to three conclusions.
Either Tobirama had a Uchiha spy on him and copied his Ninjutsu, or Tobirama used Impure World Reincarnation to obtain those Ninjutsu from him.
Or, after the disastrous defeat in the Second Shinobi World War, Sunagakure was forced to hand over these Ninjutsu, having suffered catastrophic losses in that war.
Well, based on his understanding of Tobirama, Feng Zheng believed it was highly likely that Tobirama used both of the first two methods, while Hiruzen would take advantage of the opportunity provided by the Second Shinobi World War to show that Konoha had legitimately acquired these Ninjutsu.
Of course, Feng Zheng couldn't be sure if this was true. However, the potential of these Wind Release Ninjutsu was indeed great.
In any case, the First Shinobi World War was still very brutal.
By the time the war ended, every village had to elect their Third Kage.
Only Tobirama and the Second Raikage were still alive, but they were killed during peace negotiations by the Gold and Silver Brothers' rebellion.
Perhaps this is why later wars were not as intense.
No Kage died in the Second Shinobi World War, and the Third Raikage was the only Kage to die in the Third Shinobi World War.
Feng Zheng felt that they had indeed learned some restraint by this point.
This also made Feng Zheng wonder if the First Shinobi World War was why Hiruzen emphasized peace so much, and why Ōnoki chose to stand by and be called a 'fence-sitter' instead of being more proactive.
After confirming the potential of these Ninjutsu, Feng Zheng decided to read a scroll in its entirety to understand how to learn them.
After analysis, he decided to start with the Trade Wind Blade Technique. This should help him with his Samurai Swordsmanship training with Renjiro.
However, regarding this, Feng Zheng needed to confirm it with Renjiro first.
While Feng Zheng was looking for information about the Kazekage, Mieko and Hodaka had already left the Library.
When Hodaka returned home, his father asked.
"What are you planning to learn?"
Hodaka, with a serious expression, said.
"Father, I plan to learn Body Flicker Technique."
Then he stopped. His father waited for his son's further plans, but Hodaka said nothing more. He asked again.
"And then?"
Hodaka, with a confused look, asked.
"Then what?"
He asked impatiently.
"Besides Body Flicker Technique, what else are you planning to learn?"
Hodaka once again put on a very serious expression and said.
"I will learn more Taijutsu."
This statement finally broke his father's calm expression and landed Hodaka a heavy punch. Then he dragged him to the family's Library to choose more Ninjutsu for him.
A similar scene also occurred at Mieko's home.
Her parents were pleased with her choice to learn Fire Release: Four Technique.
However, for the rest, her mother told her.
"Those two Ninjutsu don't offer much defense. Fireball Jutsu can at most defend against 1 attack, and Fire Immunity Jutsu only makes you immune to Fire Release Ninjutsu. Actually, Fire Release's defense isn't strong. Why don't you learn Earth Release or Water Release Ninjutsu for defense?"
Mieko thought about her parents' words and agreed. She said.
"Alright, but I also want to learn Fireball Jutsu and Fire Immunity Jutsu."
Her parents, knowing their daughter's talent, agreed.
Subsequently, they went to the Uchiha Library to select more Ninjutsu.
---
The next day, the brutal morning training began again.
At 10 AM, Renjiro asked.
"Have you decided what you want to learn?"
Mieko spoke first, quickly saying.
"Sensei, I've decided to learn Fire Release: Four Technique, Fireball Jutsu, Fire Immunity Jutsu, Earth Release: Earth Army Movement Technique, and Earth Release: Earth Hiding Technique."
Renjiro nodded and asked.
"Tell me why."
Mieko said.
"I've already learned Fire Release: Three Technique, so the next step is Fire Release: Four Technique. This technique is also a very powerful option in close combat."
"Earth Army Movement Technique and Earth Hiding Technique are for evading enemy attacks. Once I go underground, this will also be a strong defensive method. If I jump up and can't land in time, I can use Fireball Jutsu for defense, and Fire Immunity Jutsu can help me be immune to Fire Release Ninjutsu."
Feng Zheng listened to her reasons and thought.
"Heh heh, she memorized the entire answer! But for Earth Release: Earth Hiding Technique, I should learn it too. I hope that Ninjutsu allows breathing underground. Although I've developed several methods to ensure cracks on the surface for air circulation underground, these methods aren't very reliable."
Renjiro also noticed the recited answer and sighed inwardly.
"They are still helping her make decisions. But this plan should still be good."
He continued.
"This should be enough. However, what you need to train is to be able to cast Fire Release: Four Technique without any Hand Seals."
Mieko was confused and asked.
"Without any Hand Seals? How do I do that? Why do it that way?"
Renjiro said.
"Do you think your enemy will wait for you to finish your Hand Seals in close combat? As for how to do it, you don't need to worry, I will teach you."
Mieko was very interested in this and nodded excitedly.
Then he looked at Feng Zheng. Feng Zheng said.
"I've decided to learn Wind Whirlwind Shield Technique, Wind Wolf Technique, Wind Dragon Technique, Trade Wind Blade Technique, and Wind Body Flicker Technique."
This surprised Renjiro a bit. He thought to himself.
"This is a bit unexpected. He wants to learn five C-rank Wind Release Ninjutsu? I originally planned to suggest a few other Ninjutsu if he only chose one or two. But this is also good; I'll teach him those Ninjutsu later."
Although Renjiro quickly hid his surprise, Feng Zheng still noticed it. He sighed inwardly, thinking.
"I originally hoped to secretly cultivate these Ninjutsu, but he hardly gives me any free time. So if I only mentioned one or two, I might always be stuck with the training he assigned."
Renjiro nodded and asked.
"Why?"
Feng Zheng said.
"Wind Whirlwind Shield Technique can help me defend against frontal attacks and even counter-attack. Wind Wolf Technique and Wind Dragon Technique allow me to attack from a distance and control the battlefield. And I can attack from both land and air. Wind Body Flicker Technique is an escape technique, and as for Trade Wind Blade Technique, I think it complements Samurai Swordsmanship very well, so I plan to start with it."
Renjiro thought to himself.
"Very good. Considering no one is guiding him, it's impressive that he thought of these. Two ultra-long-range techniques, one defensive technique, one close-combat technique, one escape technique. He already has two usable mid-range Ninjutsu."
He then said.
"Good idea, but you'll also have to learn a second elemental Ninjutsu later. Wind is good for offense but not so good for defense. Also, don't learn Trade Wind Blade Technique for now. Although it can complement Samurai Swordsmanship, that's after you've fully mastered it. Right now, it would be an obstacle. Start with Wind Dragon Technique first."