My Self-Created A-Rank Ninjutsu, Rasengan

In the Land of Grass, at the Konoha camp.

More than three months had passed since the incident with Kushina. From the incident with Nawaki last year, time had flown by, and it was already early summer of the second year.

During this hot early summer, with rare moments of leisure on the front lines, many ninjas were idly passing the time in the camp during their rest periods between shifts.

Behind the camp, by a small waterfall, three Uchiha Yoru sat cross-legged on the water's surface, holding two black senbon in his palms.

Arcs of electricity occasionally flashed between the two senbon.

Meanwhile, his main body, standing before the waterfall, extended his right hand. With a solemn expression, tangible chakra visibly gathered in his palm.

"Three months. My arm is sore and swollen, but it's still not quite there!"

Uchiha Yoru gritted his teeth, his trembling hand struggling to maintain its form.

Rasengan, this A-rank ninjutsu, was still quite difficult to master even with knowledge of its training steps. It truly lived up to its A-rank classification.

Ninjutsu ranks weren't solely determined by power, but by a combination of training difficulty and power.

"Naruto started training this ninjutsu after the Chunin Exams. In terms of chakra control and foundational ninjutsu knowledge, he's definitely not as strong as I am now. His biggest advantage is his large chakra reserves, and this ninjutsu was developed based on the Tailed Beast Ball!"

As information about the ninjutsu replayed in his mind, Uchiha Yoru seemed to have an epiphany. A flash of inspiration crossed his face, and he suddenly looked excited.

"If that's the case, then this ninjutsu has another major difficulty! It's the amount of chakra! Compressing and rotating more chakra around a single point while maintaining stable output!"

Highly dense chakra spun in his palm, and Uchiha Yoru paid no mind to the burns it caused. His eyes were filled with determination.

Bang, bang!

To test his idea, he dispelled the shadow clones he was using for training and, with all his might, instantly formed a sphere of azure chakra in his palm.

"I... I succeeded!"

Upon seeing the chakra sphere in his palm, Uchiha Yoru's excitement surged. He excitedly raised the Rasengan in his hand and pressed it against a rock in front of the waterfall.

Instantly!

Rumble!

The terrifying azure chakra sphere carved a deep, circular crater into the rock.

"That brat actually succeeded!"

Tsunade, who had just arrived, saw the brat who had been training like a madman for three months and happened to witness this scene. Her eyes widened in shock.

Three months! To create an A-rank ninjutsu himself!

"I succeeded!"

Uchiha Yoru laughed excitedly before the waterfall, but then a pained expression crossed his face as he looked at his aching arm.

"Hey, hey, brat, I told you not to overdo it!"

Tsunade's sharp scolding pulled him back to reality.

Seeing Tsunade, Uchiha Yoru smiled, rubbing his trembling hand and chuckling, "Captain Tsunade, I've already placed today's supply report on your desk."

"Brat, I'm not talking about that."

Tsunade snorted impatiently, her high heels tapping on the water's surface as she walked closer, revealing her red-painted toenails.

"Brat, how many times have I told you that training with Shadow Clones is dangerous!"

Faced with Tsunade's reprimand, Uchiha Yoru became docile, lowering his head and obediently nodding. "Captain Tsunade, you said my Curse Mark Kekkei Genkai has a special kind of chakra that strengthens the body, especially in mental recovery. As long as I control the intensity, training with Shadow Clones won't be dangerous. Besides, I've been using Shadow Clones to train chakra nature transformation. This type of training only requires intense mental focus and consumes the least amount of chakra, stamina, and mental energy."

Uchiha Yoru's obedient demeanor caused Tsunade to frown in frustration. This Uchiha brat was truly obedient when he wanted to be, like when he handled administrative tasks such as compiling supply data; he was a capable hand. However, when he was stubborn, he'd nod and agree with you, only to do as he pleased later.

"Brat, extend your right hand."

Uchiha Yoru obediently extended his arm at Tsunade's forceful tone. This scene had played out countless times in the camp. Many ninjas had witnessed it, and this stark contrast led many Konoha ninjas to privately confirm one thing: that Princess Tsunade had indeed found herself a young lover, and he was from the Uchiha clan!

Chh chh!

Medical ninjutsu felt cool and soothing on his arm, bringing a sense of comfort. Uchiha Yoru smiled and looked up at Tsunade, saying sincerely, "Thank you, Captain Tsunade."

Many ninjas knew that Shadow Clone Jutsu could be used for training, but it wasn't suitable for most. The mental strain was greater; for example, if a clone was trained alongside the main body, it would take much longer to recover after dispelling it, making the overall training less efficient than normal. Furthermore, over-training carried a risk to one's life. Because of this, countless ninjas had abandoned this training method. Nowadays, perhaps only a few individuals in the ninja world, or Jinchuriki, could use it for training.

"That ninjutsu just now was very dangerous! And considering its destructive power and training difficulty, it can already be classified as an A-rank ninjutsu."

As Tsunade treated Uchiha Yoru's palm, her peripheral vision couldn't help but scan the remnants left by the jutsu he had just used, and she nodded inwardly.

Uchiha Yoru smiled and nodded at Tsunade's assessment.

"This jutsu is very powerful, and more importantly, it requires a large amount of chakra. Ordinary Chunin can only afford to use it once at most, so it's almost impossible to cultivate."

The chakra of ordinary Chunin is only enough for one use. How much training can their chakra reserves support?

It's like ninjas with large chakra reserves can use their chakra to train advanced ninjutsu ten times, while ninjas with small chakra reserves can only train once a day.

With the same talent, ninjas with more chakra can master it in three months, while ninjas with less chakra need at least ten times longer.

This is also why most Chunin are not capable enough to cultivate advanced ninjutsu on their own.

"I was lucky enough to awaken two Kekkei Genkai at the same time, and my internal chakra reserves far exceed those of the Uchiha clan ninjas."

As he said this, Uchiha Yoru even showed a smile. The chakra of Kekkei Genkai ninja is naturally stronger than that of ordinary ninjas.

Especially for the Uchiha clan, their chakra reserves far exceed those of ordinary ninjas.

Tsunade, however, snorted dismissively and raised an eyebrow.

"Then why don't you mention that Kekkei Genkai diseases cause people to die earlier than others?"

Tsunade's words left Uchiha Yoru speechless. He thought to himself that with the help of this great healer, his Kekkei Genkai disease would be completely cured (fused) in about three years.

However, outwardly, Uchiha Yoru dared not retort and could only smile awkwardly.

Seeing this, Tsunade couldn't help but let out a triumphant snort.

"Kid, it's good that you know about training, but why aren't you practicing the Summoning Jutsu I taught you!"

Upon hearing this, Uchiha Yoru showed an embarrassed expression. Could he say he didn't have time?

More importantly, he still had to maintain a part of the Uchiha persona.

Tsunade seemed to see through Uchiha Yoru's pride and couldn't help but raise an eyebrow and taunt him.

"What, are you afraid of gossip, kid?"

Just then, a sudden movement in the distant woods brought the chatting voices of two ninjas.

However, these words made Tsunade's face darken with anger.

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