After finishing all the preparations, Naruto stood in the center of the island and closed his eyes.
"Kurama, I'm ready."
"Prepare to receive my Chakra." Kurama said.
The Chakra inside Naruto's body exploded like a detonated powder magazine. The ground began to tremble, and the island beneath his feet emitted a dull rumble under the impact of the Chakra storm.
A quantity of Chakra so vast that it would have suffocated any sensory ninja on the spot surged out from Naruto's body, completely enveloping him in a golden radiance.
The golden Chakra continued to extend outward, and a golden cloak formed from Chakra materialized behind Naruto.
Naruto could clearly feel Kurama's Chakra and his own Chakra merging with unprecedented depth. It was no longer the mere borrowing relationship from before.
Mobilizing Kurama's Chakra no longer required using his own Chakra to guide the flow of the Kurama Chakra. Instead, the two forces were intertwined, like two sides of the same coin.
"Naruto, next is the Tailed Beast Transformation. This is your first Tailed Beast Transformation, so make sure you adapt to it properly." Kurama's voice rang out again, carrying a hint of eagerness.
Naruto nodded.
The next moment, an even more massive surge of golden Chakra erupted from within him, the scale far exceeding what it had been before.
The Chakra took form in mid-air, first condensing into a gigantic head of Kurama, followed by the torso, limbs, and finally, nine tails unfurling behind him in succession.
A complete Nine-Tails made of pure golden Chakra fully manifested on the island.
"Roar!" The Chakra Nine-Tails let out a roar.
Naruto floated in the center of Nine-Tails's head, observing the outside through the translucent barrier formed by Chakra.
Just then, the Chakra-condensed body of Nine-Tails paused. Immediately after, Kurama's consciousness took over the body.
It had been too long since it had walked on the ground with its own limbs.
Kurama first tentatively lifted its front paw, then jumped, kicking up a gust of wind.
"It's been so long since I've been out to experience the outside world."
Kurama hopped back and forth on the island, its movements quickly becoming fluid from the initial slight stiffness.
"Kurama, it's fine for you to get some air, but don't break the Sensory Suppression Barrier, or it will be a real headache." Naruto said.
"Got it." Kurama replied perfunctorily.
After moving around for a while, it was finally satisfied and controlled the body to sit down in the center of the island.
"Not continuing?" Naruto asked.
"Do you have some idea you want to try out? The duration of the first Tailed Beast Transformation won't be very long, so hurry up with whatever you want to do." Kurama said.
"That's right, I do have an idea." Naruto smiled and then took over the Chakra body.
He closed his eyes and infused the Chakra of his Swift Release Kekkei Genkai.
The next second, the massive Chakra body began to move rapidly within the space of the barrier at a speed completely inconsistent with its size.
A golden afterimage trailed a long tail of light across the sky above the island, taking only the blink of an eye to get from one end of the island to the other.
'As expected, other powers can be superimposed.' Naruto's lips curled slightly.
In the original story, Naruto could superimpose Sage Mode onto Kurama Mode to enter Sage-Kurama Mode.
This meant that Kurama Mode itself was a foundational framework that could accept other power systems as expansion plugins.
Swift Release is a Kekkei Genkai formed by the fusion of Wind Release and Lightning Release. In essence, it is also a complete system of Chakra application. Since Senjutsu Chakra can be superimposed, there is no reason Swift Release Chakra cannot.
"Naruto, you actually thought of this method!" Kurama's voice carried a hint of undisguised surprise.
After adapting to the speed of Swift Release superimposed on Kurama Chakra Mode, Naruto dispelled the Tailed Beast Transformation.
The massive golden Chakra body slowly shrank and dissipated, leaving only him standing in the center of the island.
Naruto turned around and checked the Sensory Suppression Barrier around the island.
The barrier was functioning perfectly, and outside, the sea surface remained completely normal.
If not for this barrier covering it, the Chakra fluctuations released by the Tailed Beast Transformation form just now would likely have been detected by sensory ninjas hundreds of kilometers away.
There were still a few days left until the ceremony for Tsunade to take office as the Fifth Hokage, so Naruto decided to continue his training on this uninhabited island.
First, he had to fully adapt to the explosive power, speed, and perception in Kurama Mode until he could use them as he pleased, and then there was another important training goal.
With this in mind, he formed a hand seal.
Multiple Shadow Clone Technique!
Three hundred Shadow Clones exploded into existence on the island, densely filling the entire clearing.
"Everyone, the training for Fire Release is left to you."
"Okay!" x300
The three hundred Shadow Clones quickly dispersed to every corner of the island.
After each Shadow Clone found a good spot, they formed hand seals and cast Fire Release: Flame Bullet.
Scorching fireballs erupted from every direction, the firelight illuminating the entire interior space of the Sensory Suppression Barrier.
Naruto's original body walked to the center of the island and sat down, then activated Kurama Chakra Mode.
He wanted to integrate the power of Kurama Mode into his combat system over these few days, allowing this power to unleash its full potential.
Walking, running, stopping suddenly, turning, jumping, attacking, defending, as well as the seamless connection of using Flying Thunder God Technique and Swift Release while in Kurama Mode.