Rasengan (Part 2)

The Rasengan, as a ninjutsu, undoubtedly holds immense value for Tobirama Senju at this stage. Even after he develops the Flying Thunder God Technique, the Rasengan's value will further increase.

After all, the Rasengan was developed specifically to complement the incredible speed of the Flying Thunder God Technique. Therefore, Tobirama Senju, known for his speed, would be interested in the half-finished product in Yuzhen's hands.

So, when would Tobirama Senju consider the Rasengan "devalued"? The answer is after he develops the "Flying Thunder God Slash."

To continue developing the Rasengan, Yuzhen needs the assistance of the Clone Technique. Where would he get it?

Tobirama Senju struggled for a moment before finally agreeing to contribute a bit more. He had already given away three ninjutsu, so adding a little more wouldn't hurt.

"For the Clone Technique, I can teach you. Shadow... hmm, how about the Water Clone Technique?"

Fortunately, he wasn't at the point of regretting giving away his possessions. The B-rank Shadow Clone Technique was unnecessary; the C-rank Water Clone Technique was also very practical.

Yuzhen didn't push his luck. He was content as long as he could gain something, so he dispersed the chakra in his hands and began practicing the Clone Technique.

The Clone Technique is extremely practical, or rather, it belongs to the most practical category of ninjutsu. When facing an enemy, 0.5 + 0.5 > 1 is often the case.

It had to be said, the feeling of splitting one's consciousness in two was quite peculiar.

Yuzhen's current paper strength surpassed that of a Special Jonin, so learning this C-rank ninjutsu was very easy for him. By the next day, he could skillfully use the Water Clone Technique.

Tobirama Senju continued to recover from his injuries and showed no immediate intention of leaving.

After mastering the Water Clone Technique, Yuzhen immediately began his Rasengan "synthesis" experiment.

Yuzhen was a cautious person with a strong sense of safety awareness, so he and Tobirama Senju went to a place far from the camp to avoid any accidental dangers during practice.

"Here we go."

Yuzhen glanced at Tobirama Senju beside him. His words served as both a signal to begin practicing and a disclaimer... You're this close; don't blame me if something goes wrong later.

As he spoke, he used the Water Clone Technique, allocating some chakra to the clone. Then, he released chakra with his left hand and compressed it with his right hand suspended above his left palm.

Once the chakra sphere had "solidified" to a certain extent, the clone's hands began to rotate the chakra sphere clockwise... Referencing Naruto, the copyright holder of this practice method, Yuzhen's movements were extremely ungraceful as he made the chakra sphere spin, his clone's hands scratching and pawing like a cat's paws.

As the clone's hand speed increased, the chakra sphere, or rather, the highly dense chakra forming the sphere, began to rotate. The initial rotation speed wasn't fast, but with the clone's efforts, the center of the chakra sphere soon felt like it had immense gravity, guiding the surrounding chakra to spin faster and faster.

Then, a short, crisp sound was heard, thick yet light, like a gust of wind blowing through a hollow steel pipe.

The seemingly weightless chakra, due to its extremely high self-rotation speed and contained impact force, made Yuzhen's palm feel a sense of weight.

"This is it..."

The shape and power of the Rasengan seemed to be present. However, before Yuzhen could even smile, the regular curvature of the chakra sphere began to twist and vibrate.

Seeing this, Yuzhen instinctively increased the restraining force with his right hand, but this only caused the chakra sphere to vibrate violently, and then...

With a "pop" sound like a balloon bursting, the chakra sphere in Yuzhen's hand exploded. The immense impact force directly turned his clone into a puddle of water, and he himself was thrown backward, landing ungracefully.

The surrounding flowers and grass suffered collateral damage.

As for Tobirama Senju? He had already silently retreated to a safe distance the moment the chakra sphere showed signs of losing control... Jokes on you, as a master of ninjutsu development, how many "experimental accidents" has Tobirama Senju experienced? There's no way he'd be affected by such a simple impact.

"Didn't master the final stage," Yuzhen said, getting up covered in dirt.

Because he had seen hope, he wasn't disheartened by the failure. He immediately began his second attempt, but the result was the same – another failure.

After five consecutive failures, Yuzhen had made no progress.

At this point, Tobirama Senju, who had been watching silently, said, "Ahem, how about I give it a try?"

"Of course," Yuzhen decided to take a break and see if Tobirama Senju had any good ideas.

Tobirama Senju used the Clone Technique, creating two more selves. He had already grasped the knack of this technique.

If the Rasengan were broken down into three parts, one part would be the large amount of chakra released, and another part would be the high-speed rotation of the chakra. These two parts were quite crude, so the technical difficulty actually lay in the final stage of shape control.

Tobirama Senju's main body cupped his hands and released chakra. One clone controlled the shape of the chakra sphere, while the other clone was responsible for the rotation.

He only tried three times before reaching the level Yuzhen had achieved earlier.

Although his approach was entirely copied from Yuzhen, Tobirama Senju's ninjutsu development ability was still astonishing.

Another "balloon bursting" sound echoed. Tobirama Senju himself immediately teleported away, while his clones were eliminated.

Yuzhen looked at Tobirama with a hint of resentment, as those eliminated clones were Shadow Clones... The B-rank ones are better.

Tobirama Senju, of course, did not fear failure. In fact, his eyes seemed to shine brighter.

The sounds of bursting balloons began to ring out one after another.

Immersed in ninjutsu development, Tobirama Senju was far more focused than Yuzhen. They made no progress on the first day, exchanged insights on the second, and on the third day, Tobirama Senju stopped eating, drinking, and interacting with anyone.

On the morning of the fourth day, Yuzhen, dozing under a large tree, heard that distinctive sound again. But he merely rolled over and ignored it.

Forming a rapidly rotating chakra sphere was no longer the difficult part; the challenge lay in the final stage of maintenance. Thus, Yuzhen had grown accustomed to this sound.

However...

Wait. Yuzhen didn't hear the bursting sound.

He suddenly opened his eyes, stood up, and looked in Tobirama Senju's direction.

Tobirama Senju had been awake all night and looked somewhat disheveled, but his face was radiant. This was because he and his two clones had finally managed to maintain the shape of the chakra sphere. At this stage, it could already be called a Rasengan.

"You... you... your talent is just too high!" Yuzhen was utterly astonished.

He wasn't comparing himself to himself but to Naruto, who was the fastest and had taken shortcuts in the process. Naruto had also taken a month to learn the Rasengan, while Tobirama Senju had only been at it for four days, at most.

"Talent?" Tobirama Senju shook his head. "It's not talent. I'm actually using the most foolish method."

The foolish method?

Yuzhen's eyes were filled with confusion. Is he not being sarcastic or passive-aggressive right now?