He analyzed for a few minutes and came to a conclusion.
"My memories of 'Naruto' are very unreliable. Moreover, it's highly possible that Konoha's Wind Release Ninja also practiced these Ninjutsu, but I just didn't know about it. This isn't surprising. But I really want to know if there was a character in the past who fully exploited the potential of these Ninjutsu!"
At this moment, he noticed something.
"I'm focusing too much and losing sight of the main point. Let's decide which Ninjutsu to learn first."
After analyzing, he decided.
"I'll start by learning Wind Style: Revolving Shuriken Technique, Wind Wolf Technique, Wind Dragon Technique, Trade Wind Blade Technique, and Wind Body Flicker Technique. I don't currently need the battlefield control provided by Air Current Dance Technique. For defense, Earth Release and Wind Style: Revolving Shuriken Technique are better choices than Gale Palm Technique. Wind Slash Technique might be useful, but I have another idea."
While analyzing the Ninjutsu, Feng Zheng also noticed two characteristics. He thought to himself.
"Isn't Trade Wind Blade Technique better than Chakra Flow? I'm curious if, in Samurai Swordsmanship, I can use it to unleash Wind Blades instead of Chakra Blades. Also, can this be used in conjunction with Chakra Flow?"
The others were Wind Dragon Technique and Wind Wolf Technique. The starting points of these two Ninjutsu were similar.
Could Feng Zheng create wolves that could unleash Wind Blast Technique, or could he create multiple Wind Dragons?
These ideas greatly piqued his interest.
He decided to experiment with them when he was strong enough.
After deciding which Ninjutsu to learn, Feng Zheng thought to himself.
"Alright, the Ninjutsu to learn have been decided. Now I'm going to scour the entire Library to see if anyone has ever pushed these Ninjutsu to their limits!"
He stood up and put away the scroll. As he stood, he saw someone.
"Huh, Mieko is here? I didn't even notice."
Then he tried to sense and noticed.
"Oh, Hodaka is here too. He's in Section D."
Hodaka and Mieko both arrived at the Library after Feng Zheng.
Unlike Feng Zheng, they had the guidance of Ninja parents.
Because they were talented enough and also received guidance from their respective family elders, they had not been to the Village's Library before; all Ninjutsu were directly taught to them by their family elders.
However, this time, the elders respected Renjiro's wishes and allowed these children to go to the Village's Library for research.
Of course, before speaking with Renjiro, the elders would first discuss Mieko's and Hodaka's training plans with them.
Hodaka was reading a Body Flicker Technique scroll in Section D. He thought to himself.
"Sigh, the Library is full of Ninjutsu. I've looked at some scrolls about Taijutsu, but they're garbage! Nothing can compare to our family's Gentle Fist. Sigh, I really don't want to waste time on Ninjutsu."
"I'll just tell my teacher I want to learn Body Flicker Technique. It was really cool watching Feng Zheng flicker around. Plus, if my enemy also knows this Ninjutsu, I won't even be able to touch him. Although Father might still scold me. Don't they understand that I just want to focus on Taijutsu?"
Meanwhile, Mieko went directly to Section C and began searching for more Fire Release Ninjutsu. She thought to herself.
"Why does my father want me to look for Ninjutsu here? Can't they just teach me stronger Ninjutsu directly?"
However, during her search, she discovered something that surprised her. She thought to herself.
"Fire Release: Four Technique? Why is this Ninjutsu in Section C? Shouldn't it be a Rank B Ninjutsu? And Fire Release: Five Technique should be a Rank A Ninjutsu, right?"
She took the scroll and began to read. After finishing, she was very satisfied, she thought.
"Finally! This Ninjutsu finally has some power."
Fire Release: Four Technique is similar to Fire Release: Two Technique. It uses two fingers to point and release a heat ray.
However, the power at this stage is much higher. This is equivalent to using a very hot kunai. Mieko thought to herself.
"With this, I can engage in close combat with Hodaka and Feng Zheng. Being hit by it would be very painful, and it's difficult to dodge at close range. Although I'm reluctant to admit it, both of them are much stronger than me physically. Even though I have the Sharingan, Hodaka's Gentle Fist is really difficult to deal with."
"With this Ninjutsu, I can become as strong as them in close combat, and I'm already superior to them in long-range combat."
Then she continued to look for other Ninjutsu. She decided to learn Fire Release: Flame Sphere Technique and Fire Prevention Technique, she thought to herself.
"I don't have any defensive Ninjutsu. These might be somewhat useful."
Feng Zheng ignored his teammates and began to research the Kazekage. He knew very little about the Kazekage. He thought.
"The curriculum didn't mention much about past Kazekage. Moreover, the books didn't mention which Ninjutsu were used by Kage from other Villages. I remember Gaara, his father, and the Third Kazekage. But there isn't much content to review."
"Gaara manipulates sand, Rasa manipulates gold, and his predecessor manipulated iron. All their battles revolved around this. I hope the First and Second Kazekage weren't like this. And it's impossible for the Third and Fourth Kazekage not to know other Ninjutsu."
He spent some time gathering all the information on the three Kazekage.
He had already read about Rasa in the "wanted manual". Unfortunately, the "wanted manual" did not keep information on deceased individuals.
After nearly two hours of reading various scrolls and summarizing, Feng Zheng understood, he thought to himself.
"I understand. The First Kazekage was a user of the Magnet Release Bloodline Limit. He was the founder of Hidden Sand Village. Unlike Hashirama, he established the Village with an iron fist. Many nearby tribes and families were forced to join or withdraw."
"It seems he wanted to maintain the Kazekage's position within his clan, so he declared his second son as his successor. But sadly for him, Tobirama killed his three sons during the First War. Later, he was killed by the Second Tsuchikage's Dust Release in the same war."
"Since there was no one strong enough in the family, they had to appoint one of the First Kazekage's students as the Second Kazekage. At the same time, they began to train the First Kazekage's grandson to contend for the position of the Third Kazekage."
Although all the Kazekage were masters of Wind Release Ninjutsu, the Second Kazekage was the true Wind Release master.
The legends of Wind Release Ninjutsu on these scrolls should all have come from him.
To defend an important location, he created a Wind Dragon so large that its tail couldn't be seen.
He could also create hundreds of Wind Wolves to attack enemy forces.
He could also fly and had fought the Second Tsuchikage several times.
And Danzo's Vacuum Ninjutsu also seems to have all come from the Second Kazekage.
Tobirama killed the Second Kazekage near the end of the First War.
However, they did not surrender but retreated into the desert, and no one dared to march against them.
How exactly did Konoha acquire these Ninjutsu?
It's unlikely that both Konoha and Sunagakure possessed these Ninjutsu. So either they were from Hidden Sand Village, or more likely, Konoha stole them from the other side.