Flying Thunder God Technique, Great Spiraling Ring?

"Naruto, the great iron gate of the sealed space can't be marked with the Flying Thunder God Technique, even though it looks like a real object."

It was already late at night, and Minato Namikaze was standing next to Kurama's paw, explaining to Naruto.

After leaving a message for Shikamaru, Naruto went straight home, as there was no point in staying there any longer.

Moreover, according to what Shikamaru had said before, he would often come to find Naruto in the future because the Hokage still needed him to report the situation. This made it even more impossible for Naruto to practice the Flying Thunder God Technique there.

After returning home and eating lunch, he had been in the sealed space researching his father's signature technique, the Flying Thunder God Technique, with him.

Naruto was still pondering the principles of the Flying Thunder God Technique until now.

The Flying Thunder God Technique is a space-time Ninjutsu.

In the world of ninjas, space-time Ninjutsu is actually very common, such as Summoning Jutsu.

Summoning Jutsu, this kind of space-time Ninjutsu, is completely unreasonable. It can allow ninjas to directly communicate with their summoned beasts that have signed a blood contract, ignoring dimensions and space.

Nagato in the Ninja World could even directly summon the Ten-Tails' outer shell from the core of the moon in the sky to his side.

Moreover, Naruto had seen many similar summoning scenes when he watched Naruto in his previous life.

For example, in the early stages of the anime, the toads of Mount Myōboku could be summoned to Konoha by Jiraiya and Naruto, and later Naruto could also be reverse-summoned to Mount Myōboku by the toads.

There are also the two storage scrolls Naruto currently has. These scrolls themselves fall under the application of space-time Ninjutsu, and they are the simplest.

As long as ninjas carry these scrolls with them, they can summon and retrieve pre-stored ninja tools from the scrolls by inputting Chakra, and they can also seal them back afterward.

Tenten from Konoha is the most representative figure.

Of course, Naruto believes that the strongest Summoning Jutsu is definitely Impure World Reincarnation.

This forbidden Jutsu, developed by the Second Hokage, can even break the boundaries of life and death, exploit loopholes in the rules of reincarnation, and directly summon the souls of the deceased to the present world.

The Flying Thunder God Technique is more of an application of reverse summoning within the category of space-time Ninjutsu. However, during the summoning process, the key is not blood, but Chakra, and the contract is with oneself.

The entire casting process is through one's own Chakra, after sensing the coordinate formula, to summon oneself to the marked location.

The Second Hokage, referencing Summoning Jutsu, specifically developed a unique principle for the summoning formula for the Flying Thunder God Technique. During the casting process, it also combined Body Flicker Technique and Sealing Jutsu.

First, the most important condition for casting the Flying Thunder God Technique is that it requires extremely high personal sensory ability.

The main reason why Naruto's father's three personal guards could not master the Flying Thunder God Technique was their poor sensory ability.

When separated, the three of them could not accurately lock onto the formula marks they made through their own senses, forcing them to use a clumsy method of linking their senses to the same frequency and cooperating with each other to barely cast the Flying Thunder God Array.

Therefore, another prerequisite for casting is to make formula marks in the area of movement when activating the Flying Thunder God Technique.

It should be said that marks must be made first.

The mark for casting the Flying Thunder God Technique is generated by one's own Chakra. The moment the mark is left, a Sealing Jutsu must be cast simultaneously to completely perfect the formula of the mark.

This way, the coordinate formula left behind will never disappear. Minato Namikaze specifically emphasized this to Obito Uchiha during the final Great Ninja War in the Naruto anime.

However, after Obito became the Ten-Tails' Jinchuriki and reshaped his body, he destroyed the Flying Thunder God Technique mark sealed on him.

Combining the memories passed down to him by his father, Minato Namikaze, Naruto found that when he first started researching the Flying Thunder God Technique, he had no guidance, and he wasted some time in sensing and understanding the formula runes.

However, his talent was very high. With the help of his mother, Kushina Uzumaki, by learning a large number of the Uzumaki Clan's unique Sealing Jutsu and many unique sensory training methods, he quickly got the hang of the Flying Thunder God Technique.

According to his father, Naruto now has the advantage of possessing a vast amount of Chakra, has mastered his sensory abilities, and also knows Sealing Jutsu. His father also taught him the core summoning formula of the Flying Thunder God Technique.

What he needs to do now is very simple: first, make a formula mark at the location he wants to move to, then sense the Chakra within the formula mark he left. As long as it resonates with the Chakra in the formula mark, he will be instantly summoned by the special reverse summoning formula within the formula mark.

After Naruto felt that he had met the conditions to get started with the Flying Thunder God Technique, he originally planned to go to the Mirrored World to challenge his father's data puppet, wanting to experience what it felt like to face the Flying Thunder God Technique first.

As a result, he found that he could not challenge his father Minato Namikaze's data puppet, with a prompt stating that relevant character data was insufficient.

Then, when he wanted to challenge other puppets in the Mirrored World, he tried to mark them with the formula imprint, intending to directly apply the Flying Thunder God Technique in combat to see how it worked.

But as soon as he used Shadow Clones to surround and attack the puppets to make marks, the battle would inexplicably end forcibly.

The prompt sound was like being poisoned, constantly displaying "Please complete relevant data."

After discovering that he could not practice the Flying Thunder God Technique in the Mirrored World, Naruto shifted his attention back to the sealed space.

In the sealed space, Naruto made attempts. Ninja tools like Kunai could be projected in, and other Ninjutsu he knew could also be performed in the sealed space.

Then he set his sights on the sealed gate.

He made attempts; the gate could be attacked by Ninjutsu, and sparks could be scraped off it with Kunai.

But he just couldn't mark it with the Flying Thunder God Technique imprint.

And so, Minato Namikaze's explanation at the beginning that this iron gate was not a real object but merely a manifestation of the seal came about.

"It seems I need to find an opportunity to avoid the surrounding surveillance," Naruto thought, and decided to put aside practicing the Flying Thunder God Technique for the time being.

After thinking for a moment, Naruto walked two steps to Minato Namikaze's side inside the iron gate and asked, "Father, let's study how to add elemental transformation to the Rasengan now."

A hint of embarrassment flashed across Minato Namikaze's face as he said, "Uh, Naruto, actually, I was researching how to add elemental transformation to the Rasengan when I was alive. For this, I even specifically consulted Jiraiya."

"However, Jiraiya, who also learned the Rasengan, couldn't do it either. Later, we considered trying to forcibly break through this barrier by utilizing Sage Mode's enhancement of Chakra, but by the time I learned Sage Mode, I had already become the Hokage, and my time at Mount Myōboku was extremely limited."

"You know what happened afterward. I didn't have time to thoroughly research how to add elemental transformation to the Rasengan."

"So, the question of how to add elemental transformation to the Rasengan is something you and I are starting from the same point."

Naruto's heart sank when he heard this. He knew that his father's idea of using Sage Mode was correct.

In the original work, although Naruto finally upgraded the Rasengan into a Rasenshuriken by changing its nature with wind chakra, the Rasenshuriken at that time was only 50% complete.

Not only was its state unstable, but it also required point-blank attacks, and the side effects of harming both the attacker and the target were immense.

Later, after Naruto went to Mount Myōboku and learned Sage Mode, the Rasenshuriken in Sage Mode finally had no flaws and could be thrown perfectly, achieving 100% completion in its nature transformation.

Today, one unfortunate thing after another has happened. If this continues, his upcoming training plan will have to be reconsidered.

"Heh~ Fourth Hokage, you're the one who made it so complicated! Why not try to further strengthen the Rasengan? It's like the Tailed Beast Bombs our Tailed Beasts spit out; the more chakra, the greater the power of the Tailed Beast Bomb."

Kurama, who was lying nearby, suddenly propped himself up with his paws and sat up as he spoke.

"Uh, strengthening the Rasengan like a Tailed Beast Bomb requires a massive amount of chakra, and my chakra..." Minato Namikaze was stunned. He suddenly realized that his son's situation was completely different from his own.

His son possessed the physique of the Uzumaki Clan and did not lack chakra at all.

Upon hearing this, Naruto's eyes lit up. What Kurama said was entirely feasible. In the original work, after strengthening the Rasengan, there was an advanced version called the Big Ball Rasengan.

Kurama had already told him how the Tailed Beast Bomb was condensed. Thinking of this, Naruto immediately sprang into action. In the blink of an eye, a fist-sized Rasengan formed in his palm, and then he began to gradually inject more chakra into the existing form of the Rasengan.

In the Sealed Space, the Rasengan in Naruto's hand grew larger and larger, quickly reaching the size of a soccer ball, and it showed signs of continuing to grow.

Seeing this, a strange thought flashed through Naruto's mind. He suddenly controlled the chakra within this large Rasengan and began to compress its density in the same way a Tailed Beast Bomb was condensed.

Just as Minato Namikaze, sensing something was wrong, was about to speak, Kurama on the side flicked a claw, signaling him not to interrupt.

The large Rasengan in Naruto's hand rapidly shrank again. After a few breaths, the entire Rasengan was compressed back to the size of a fist, and then it turned black.

Under Naruto's perception, the density of the chakra within this thing, which he wasn't sure was still a Rasengan, had been compressed to an unimaginable degree. The entirely black sphere was also surrounded by several rings of irregularly rotating light.

These rings were like the planetary rings he had seen in sci-fi movies in his previous life, where matter formed a ring around a planet.

"What kind of Rasengan is this?"