I'm retrieving corpses in Konoha.

This bottle of pills is the reward from the system's transaction just now, the Immortal Pill.

This name reminded Uchiha Natsu of the Sage of Six Paths, but he didn't know if Sagemaru had anything to do with him, or if it was even a product of this world.

After all, there have been precedents before; the Giant Bear Big Gray was not from this world, and the corpse recycling system can provide many things from outside this world.

The surface of the pill seemed to have a faint halo flowing around it, which looked magical.

However, seeing a pill look like this, Uchiha Natsu hesitated to take it.

Although the system has a good reputation and the items traded match the descriptions, it's still best to find someone to test the medicine first to be on the safe side.

After thinking for a moment, Uchiha Natsu turned his head and looked at Uzuki Yugao.

"Xiyan, I'll demonstrate one of my signature sword techniques for you. Watch carefully." Uchiha Natsu first put away the medicine bottle, then drew the samurai sword from his back.

Uzuki Yugao immediately perked up, overjoyed. Uchiha Natsu's words clearly indicated he was going to teach her swordsmanship.

Therefore, Uzuki Yugao also drew her katana and said earnestly with her little face, "Ready, teacher."

Uchiha Natsu nodded slightly, then held his katana diagonally in front of him.

The chakra within his body circulated according to his memory, and the katana began to sway slightly.

[Konoha-ryu Swordsmanship - Willow]

Uzuki Yugao observed very carefully, her mind completely focused.

But when Uchiha Natsu started moving the katana in her hand, she noticed that the katana began to create afterimages.

It seemed not to be an afterimage, but rather a blur of reality and illusion. In the end, dozens or even hundreds of identical samurai swords swayed before my eyes at the same frequency.

Like a willow swaying in the wind, Uchiha Natsu's figure also completely disappeared.

Uzuki Yugao was somewhat flustered, with only these strange samurai swords in front of her, and she couldn't concentrate at all.

"Did you see it clearly?"

Just then, a magnetic voice rang in her ears, and the sword shadow in front of Uzuki Yugao vanished instantly.

Looking down, she saw a samurai sword held horizontally in front of her neck, and her teacher standing behind her.

Uzuki Yugao was stunned for a moment, then suddenly came to her senses.

This is incredible! She had never seen or even heard of this kind of swordsmanship before.

"Teacher, what is the name of this sword technique?" Uzuki Yugao asked excitedly.

Uchiha Natsu sheathed his katana and said, "This move is called 'Willow,' one of the Konoha-style sword techniques developed by the Second Hokage, and it has an S-rank difficulty."

After a pause, Uchiha Natsu took out a bottle of pills from his pocket and said seriously, "Your physique is not yet strong enough to learn this technique, but I have prepared pills to enhance your physique. After taking them, your physical abilities will be improved."

"Ah! Thank you, teacher!" Uzuki Yugao was touched. Uchiha Natsumi had only been with her for a day, yet he had already prepared such a thoughtful training plan for her.

She hadn't been able to help at all in the battle with the ninjas just now, so Uzuki Yugao secretly vowed that she would definitely help her teacher when she became stronger in the future.

Seeing Uchiha Natsumi's excited expression, he smiled, poured out a Sage Pill from the medicine bottle, and handed it to Uchiha Natsumi.

"Eat now. Once your physique improves, you can start learning this swordsmanship."

Uzuki Yugao nodded vigorously, then carefully took the Senjinmaru, first observing its peculiar appearance before putting it in her mouth.

Uchiha Natsu stared intently at Uzuki Yugao's reaction.

Uzuki Yugao felt a little nervous under Uchiha Natsu's gaze, but just as she was about to say something, she felt a sudden unsteadiness under her feet.

As if he were drunk, his whole body began to heat up, his cheeks flushed instantly, and his reactions became sluggish.

Uchiha Natsu noticed that Uzuki Yugao's body began to sway, and her eyes became somewhat vacant; such behavior could only occur in someone who was extremely drunk.

"As expected, there are side effects. Luckily, I didn't take any random medication..." Uchiha Natsu put the medicine bottle away.

"T-Teacher..." Uzuki Yugao felt like she was walking on cotton, and she lost her balance and fell to the side.

Uchiha Natsu quickly went over and helped Uzuki Yugao up. Then he found that Uzuki Yugao had closed her eyes and fallen asleep.

The pills given by the system certainly wouldn't be poisonous; Uchiha Natsu trusted the system completely.

The reason for having Uzuki Yugao test the medicine was to prevent the current situation from occurring.

If Uzuki Yugao faints, he can take care of her.

But if Uchiha Natsumi faints on his own, he has absolutely no faith that Uzuki Yugao has the ability to protect him.

"It seems we'll have to rest here for now." Uchiha Natsu raised his head, glanced at the setting sun, and murmured.

Uzuki Yugao was sleeping soundly, as if no noise could wake her.

Uchiha Natsu used Earth Release ninjutsu to build a basement underground, and then settled Uzuki Yugao inside. Uzuki Yugao slept soundly and even snored slightly.

After settling Uzuki Yugao in, Uchiha Natsumi went outside.

In the story, Naruto and Jiraiya learned the Rasengan, and the anime explained this part in great detail.

From the moment he transmigrated into the Naruto world, Uchiha Natsu had planned to learn the Rasengan, so he would recall the plot of his previous life whenever he had free time, and had already remembered most of the details.

However, due to limitations in his own chakra reserves and control, the plan was shelved.

Now that I know my chakra is ridiculously abundant and my control over it is beyond the reach of ordinary people, it is necessary to restart my Rasengan training program.

Chapter 13 Changes

The Rasengan can be further developed into many advanced and powerful ninjutsu.

Moreover, even in the early stages, it is a powerful skill.

It can activate ninjutsu without hand seals or weapons, and often produces unexpected effects.

Uchiha Natsu took a scroll from the left pocket of his Chunin vest and opened it.

It contains materials that were prepared beforehand for training the Rasengan.

A bunch of water-filled balloons, and a bunch of balls.

With a long sigh, Uchiha Natsu first tried to gather chakra in his hands with his bare hands.

Unexpectedly, this step went exceptionally smoothly, and the chakra naturally gathered in his hand.

After completing the first step, Uchiha Natsu picked up a water-filled balloon, held it in his hand, and then poured chakra into the water inside the balloon.

[A book-reading app recommended to me by a friend I've known for ten years, Wild Fruit Reading! It's damn good! I use it to read aloud and listen to books while driving or before bed to pass the time. You can download it here.]

Without hand seals, it is extremely difficult to control chakra as it leaves the body.

If it were easy, the Fourth Hokage wouldn't have spent three years developing the Rasengan, and Naruto wouldn't have practiced for so long to master it.

Uchiha Natsu controlled his chakra, causing it to move erratically within the water sphere, becoming increasingly violent.

A short while later, the balloon burst with a "pop".

"So easy?" Uchiha Natsu looked at the water remaining on his hands, somewhat surprised, yet seemingly reasonable.

After all, it's extremely difficult to find someone with his level of control over chakra.

All the remaining balloons were discarded, and Uchiha Natsu went straight to the third stage, replacing the water balloons with harder leather balls.

Just like before, under Uchiha Natsu's precise control, the ball was easily burst open in one fell swoop.

The whole process went very smoothly, and only a few minutes had passed before Uchiha Natsu finally condensed the Rasengan in his hand.

Looking at the ball of chakra spinning rapidly in his hand, Uchiha Natsu found a large tree nearby and then hurled it.

The Rasengan shot out with a "whoosh" and slammed straight into the thick tree trunk.

"Oh!"

A heavy explosion rang out, sawdust flew everywhere, and the trunk of the large tree burst open.

"call!"

After being bisected by the Rasengan, the thick tree slowly fell and crashed to the ground. Startled, nearby birds took flight, fleeing the dangerous place.

"Now I've learned the Rasengan. I'll have another advanced ninjutsu to go."

Uchiha Natsu felt that after condensing a Rasengan, he still had a lot of mental energy left.

So, Uchiha Natsu raised his other hand, recaptured the feeling from before, and simultaneously condensed Rasengan in both hands.

This time, the condensation speed was much faster than before, almost instantaneous, and two condensations were completed simultaneously.

"Whoosh whoosh..."

Uchiha Natsu condensed a Rasengan in his left hand and threw out a Rasengan in his right hand; when he condensed a Rasengan in his right hand, he threw out a Rasengan in his left hand.

This cycle repeated itself endlessly, like a machine gun firing one Rasengan after another, creating a continuous roar.

Just a short while later, a large section of the forest in front of Uchiha Natsu was smashed, with hundreds of towering trees lying twisted and crooked on the ground, and small animals that had been resting there scattered and fled.

This terrifying power is comparable to some forbidden techniques.

"Let's call this move 'Rasengan'." Uchiha Natsu gave a name to his "improved" new ninjutsu, which he created using chakra.

Imagine if you were ambushed by a group of ninjas, and they just threw out a bunch of Rasengans – it would be a truly spectacular sight.

Even Uchiha Natsu, whose chakra was so abundant he couldn't use it all, could create shadow clones to make Rasengan.

When hundreds of shadow clones use the Chain Rasengan at the same time, the sight will be truly breathtaking.

However, Uchiha Natsu did not immediately conduct the experiment. After all, such great damage had already been done to the environment, and if it continued, it would not be easy for nature to heal the wounds.

Having finished his Rasengan training, Uchiha Natsu stretched and turned back to the basement he had built.

Silent all night.

The next morning, Uchiha Natsu got up early and went out to find food.

I only ate a few ration pills last night, but they taste really bad. It's okay to eat them once in a while when I'm on a mission, but eating them all the time would put a strain on my stomach.

Therefore, this morning, Uchiha Natsu ran to the nearby river, caught a few fish, and then made a fire to grill them.

After the fish was grilled, Uzuki Yugao woke up.

The shadow clone left in the basement saw that Uzuki Yugao had woken up, so it immediately brought her to the surface and then used earth-style techniques to erase the basement.

When Uzuki Yugao woke up, she immediately felt refreshed, as if endless power was surging within her.

I tried to mobilize my chakra and found that it flowed through my meridians like a torrent, without any stagnation whatsoever.