Kushina's Multiple Shadow Clone Technique was not learned from Second Hokage in Amegakure after being released by Impure World Reincarnation.
Regarding Multiple Shadow Clone Technique, Kushina has been mastered while alive.
In the original work, Tsunade personally said, "Naruto is the same as Kushina in terms of personality and ninjutsu."
If the target is to change to someone like Hiruzen Sarutobi or Kakashi who has mastered too many ninjutsu, then this statement cannot complete the inference.
But Naruto?
One Shadow Clone Jutsu, one Rasengan.
What else?
Oh yes, there is also the art of seducing.
It can't be that Tsunade means that Kushina also knows how to do childbirth, right?
As a pure Uzumaki Clan bloodline, Kushina has a huge amount of Chakra, and the number of Multiple Shadow Clone Technique is not inferior to that of Naruto.
As for Naruto, since they had taken off for a whole day before, they were already a little tired. The number of Shadow Clone Jutsu was obviously less than that of Kushina.
"Damn bad woman, you secretly learned my Multiple Shadow Clone Technique."
Naruto realized that he was at a disadvantage and quickly began to think of countermeasures.
(Tobirama Senju: Say whose it is again?)
"What an idiot I am!"
Naruto Suddenly thought of something, slapped his head and cursed himself.
He had been thinking about developing Rasenshuriken and mastering Tailed Beast Bomb before, but he always thought that he had not mastered these two, but he ignored one question - he could still use this ordinary Rasengan casually?
Why does he keep fighting with his fists?
"Rasengan!"
A Shadow Clone Jutsu of Naruto, with the assistance of two Shadow Clone Jutsu next to it, created a Rasengan, defeating a Shadow Clone Jutsu of Kushina.
Immediately afterwards, Naruto, who had regained the familiar feeling, began to fight back, and a large number of Shadow Clone Jutsu began to rub Rasengan.
"Rasengan, right...Rasengan!"
Kushina saw Naruto in front of him use Rasengan, he lowered his head and glanced at his right hand, and instantly rolled out a ball and pointed it at it.
At the same time, Shadow Clone Jutsu of Kushina also started to use Rasengan.
It's as if Naruto just broke the unspoken rule of "not using ninjutsu".
--Kushina, of course, can Rasengan.
Minato's biography clearly stated that Minato Namikaze developed Rasengan because Rasengan is suitable for Chakra's large number of Kushina.
At the same time, Rasengan also gets inspiration from Tailed Beast Bomb. Mastering Rasengan and developing Rasengan can also help Jinchuriki master Tailed Beast Bomb step by step.
"Ah? Why did Rasengan learn from it secretly? Could it be that this bad woman is just like Kakashi-sensei, a bitch ninja?"
Naruto saw Kushina also using Rasengan, with a face of shock, confusion and aggrievement.
It's like DIO discovered that Jotaro entered the cheat code "It looks like he is the same type of substitute" and then gained the ability to stop time.
"What should I do? Kurama?"
Naruto was at his wits end and started asking for help Nine-Tails.
The other party has the same model Nine-Tails Chakra Mode, Multiple Shadow Clone Technique, and Rasengan.
He even has one more Adamantine Sealing Chains than him.
As well as unlimited Chakra, unlimited recovery Impure World Reincarnation Body.
It's like fighting another self with unlimited firepower. How do you fight this?
[...]
"Kurama, what are you talking about? I don't want you to use my body to use Tailed Beast Bomb, right?"
Naruto saw that Nine-Tails remained silent and came up with an idea.
Jinchuriki can still use Tailed Beast Bomb without mastering Tailed Beast Bomb. The method is to let Tailed Beast take over the body.
This is also the reason why each country that owns Tailed Beast can use Tailed Beast as a war Weapons.
Tailed Beast can spontaneously use Tailed Beast Bomb.
Jinchuriki masters Tailed Beast Bomb, which is the "extra skill" developed by Kumogakure after it created Perfect Jinchuriki.
After all, if Jinchuriki wants to use Tailed Beast Bomb, the first condition is that Jinchuriki must first be able to call Tailed Beast Chakra independently.
Not to mention reconciling with Tailed Beast, we must at least reach the first stage of Jin Ming.
When Killer B was teaching Naruto on Turtle Island, a fellow ninja helped explain these things, and Naruto also took note of them.
[No, even if I use Tailed Beast Bomb, won't the opponent also use Tailed Beast Bomb? Naruto, you have to think about what is your unique ability to defeat her.]
Nine-Tails rejected Naruto's proposal without even thinking about it.
The reason given by Nine-Tails is very reasonable.
Indeed, although Kushina has not mastered Tailed Beast Bomb, she can also learn from Naruto and give her body to Nine-Tails and let Nine-Tails use Tailed Beast Bomb.
Besides, even if you don't use it, so what?
[Don't forget, she is the body of Impure World Reincarnation. Even if Tailed Beast Bomb and Impure World Reincarnation's body is completely destroyed, it will only take minutes to recover.]
Nine-Tails added another sentence in order to prevent Naruto from having this idea again.
"Yes, Impure World Reincarnation."
Naruto's face drooped.
Naruto is thinking again.
He recalled the reminder Nine-Tails had given him before.
Physical harm is useless, mental harm is needed.
Reverse Harem Jutsu has been used, do I need to use it again?
Wrong!
He actually has another move, which also comes with a mental attack technique!
This move was originally intended to be used in conjunction with Sasuke Fire Release Ninjutsu, but he didn't expect to use it now.
"Kurama, I'm going to break the seal."
Naruto touched his belly.
Since the reconciliation with Nine-Tails, Nine-Tails no longer lives in a cage.
Eight Trigrams Seal Of course there is no need.
But Naruto cleverly carried out "waste recycling" and sealed the "Toad Oil" produced after eating Mount Myōboku's "oily fish" food.
That's right, it's the same thing that Naruto thought he was going to fart and ended up washing his pants by the river.
"What is this kid going to do again? Hasn't he already reconciled with Nine-Tails? Why is he still turning the seal of Eight Trigrams Seal?"
Kushina's main body has been paying attention to Naruto's situation from a distance, and became confused after discovering Naruto's actions.
Naruto's main body called a shadow clone, which carried him on its shoulders like a human cannon, and then aimed it at the battlefield.
"Take my move - Toad Oil jet!!!"
Shadow Clone Jutsu pulled Naruto's cover, and then a flow of mud and rocks spurted out.
Kushina's eyes widened and he hurriedly dismissed Shadow Clone Jutsu.
The Kushina and Shadow Clone Jutsu on the field quickly dissipated with bang bang bang bang.
--She doesn't want to receive the sensation of being showered by Shadow Clone Jutsu from every angle.
Some Shadow Clone Jutsu were too late to release, and disappeared while running and dodging.
A Shadow Clone Jutsu ran next to Kushina. Kushina didn't pay attention. Suddenly, the Shadow Clone Jutsu turned into Naruto and attacked Rasengan.
--Naruto didn't bring any malicious intent this time.
After Naruto thought over and over in his heart, he gave up the idea of taking back Nine-Tails Chakra. At the same time, he knew clearly that Rasengan could not cause substantial harm to Impure World Reincarnation's body, so there was no malicious intent.
"Super Great Ball Rasengan!"
Rasengan, which was attacking Kushina, was pushed back by Naruto, who was rushing over with his pants, and turned into a huge Super Great Ball Rasengan.
Although the attack method was very cumbersome, this series of attacks made Kushina very pleased with Naruto's combat intuition, and he simply stopped using Nine-Tails Chakra for defense.
Without Nine-Tails Chakra's defense, Impure World Reincarnation's body was as fragile as a piece of paper and instantly turned into ashes.