I Punch the Tailed Beast Ball

”First of all, I can teach you how to train and enhance your spiritual power, but spiritual pressure cannot be directly trained. It will change over time. As you continue to fight and improve, your spiritual pressure will naturally increase...”

In this way, spiritual pressure in the world of Shinigami is quite similar to spiritual energy in Naruto.

As everyone knows, chakra in Naruto is a combination of physical energy and spiritual energy. Spiritual energy cannot be specifically trained to grow. Instead, it accumulates through various experiences and training, thereby increasing.

Spiritual pressure strengthens as the density of spiritual power increases. If a ninja specialises in Yin Release, their spiritual energy will be significantly higher than that of an average ninja.

It’s worth mentioning that physical energy is not just about physical strength or muscle power. It doesn’t mean that people with more chakra are necessarily stronger physically; there’s merely a correlation.

Physical energy refers to the energy contained in the body’s cells. This is why transplanting Hashirama’s cells can significantly increase one’s chakra. Hashirama’s cells have unparalleled vitality and life force, giving them extraordinary physical energy.

Of course, while there are similarities, there are also differences since these are systems from two different worlds. They seek their similarities mainly to help Kakashi and the others understand more easily.

”In the beginning, you should focus on strengthening your spiritual power. Later on, you’ll need to increase the density of your spiritual pressure. Only when your spiritual power’s density is high enough can it be called spiritual pressure.”

After teaching the three how to train, Nagasawa also mentioned some precautions.

Shinigami also have natural talents. While training can strengthen spiritual power, everyone starts at different levels. In the Shinigami world, the Shin’ō Academy has methods to test this. Some geniuses can reach lieutenant-level spiritual pressure even before enrolling.

However, Nagasawa wasn’t sure if the system’s granted abilities would show significant differences in talent since Kakashi and the others weren’t Shinigami but living humans.

After some thought, Nagasawa suggested, ”Remember to record your changes after each training session and submit a report to me every week.”

Kakashi and the others were the first to train in spiritual power so that proper documentation would facilitate research.

Except for Inuzuka Midori, who looked somewhat distressed, Kakashi and Yanshui calmly nodded in agreement.

For Inuzuka Midori, writing was a bit of torture. She’d instead train more. She was out of ninja school; why did she still have to write things like this? Important mission reports? Yanshui had always been the one writing those.

Later, Nagasawa found Shisui and explained spiritual power and pressure to him, just like he did with the others, teaching him the training methods.

As for others, Nagasawa wasn’t planning to teach them yet. Shisui and the other three were among the more talented in Konoha, so he wanted them to test the effects first.

Having taught what needed to be taught, Nagasawa had a shadow clone handle some less critical tasks and started his training.

The Captain-Commander’s power was immense, providing Nagasawa with significant strength.

However, merely using the Captain-Commander’s power wouldn’t lead to a substantial breakthrough in his ultimate strength. The Captain-Commander’s Bankai, Zanka no Tachi, could reach temperatures of fifteen million degrees Celsius, comparable to the sun’s core. Nagasawa’s full-powered Breath of the Sun Sage Mode could achieve a similar effect.

Nagasawa needed to integrate the template’s power into his system, making it a puzzle.

Of course, this couldn’t be done now. It required the template’s fusion rate to reach one hundred per cent, fully integrating it into his body.

For now, he could explore whether spiritual power and pressure could interact and cooperate with chakra as an essential operation, laying the groundwork for future endeavours.

Nagasawa sat on a large rock on a high mountain in the Land of Fire. He raised his fist, enveloped it with spiritual pressure, and then gathered chakra in his fist.

His brow furrowed slightly.

When chakra and spiritual pressure collided, they caused a certain level of disruption, preventing standard control.

However, this didn’t trouble Nagasawa. He enveloped his fist with spiritual pressure while letting chakra flow within his fist.

He then struck an irregular black iron block in front of him.

Boom!!!

The punch created a powerful air current that bent the surrounding trees, bursting the air with a roar.

However, the black iron block directly hit by the punch only showed five cracks and didn’t shatter.

”Five cracks, huh...” Nagasawa fell into contemplation.

The target he hit was an upgraded version of chakra metal, super chakra metal.

Although chakra metal is brutal, it’s relatively easy for Nagasawa to cut through it like tofu.

So, Nagasawa had Master Tetsu create a reinforced version, a super chakra metal that even super shadow-level individuals would struggle to destroy.

When Nagasawa asked for it, Master Tetsu initially declined, stating it was impossible. Creating chakra metal was already challenging, requiring Nagasawa’s help, and crafting something ten times harder was too much to ask.

After much persuasion, Nagasawa got Master Tetsu to agree, needing Nagasawa’s flames for assistance.

Eventually, after a long research period and using numerous ores, they created super chakra metal, which was less absorptive of chakra but significantly more complex than chakra metal.

The materials alone cost millions of ryō, and Nagasawa had to assist, making only ten for his training.

Even super chakra metal couldn’t withstand Nagasawa’s full power. He couldn’t use sage mode or breathing techniques, just chakra, and had to hold back.

Such hardness was remarkable. If Metal could resist six-path level attacks, Nagasawa would question Master Tetsu’s identity, suspecting him of being an alien.

Nagasawa continued training, breaking two super chakra metals and gaining a deep understanding of their hardness.

His controlled chakra would have caused only four cracks if he hadn’t used spiritual pressure.

However, spiritual pressure didn’t consistently boost power by a quarter since his chakra usage was minimal compared to his total, while spiritual pressure had a different ratio.

With a fifty per cent fusion rate, Nagasawa had only half of the Captain-Commander’s spiritual pressure strength.

In general, Shinigami didn’t enhance their fists with spiritual pressure for combat.

Nagasawa missed the challenge tasks given by Tobirama. Controlled training felt tedious, unlike the challenges where he could exert full power against three six-path level opponents.

Sadly, after completing the challenge, there were no more tasks.

Simulated training needed to be more costly. Developing his sage mode burned through many points.

Now, he needed points for opening spiritual power and pressure, buying Zanpakuto, or increasing prosperity, all requiring significant expenditure.

He had no fusion template back then and valued sage mode development, making it a priority.

”Wait, the system never said I couldn’t re-enter a completed challenge world after succeeding,” Nagasawa thought, inspired.

The system had limited information, with exchangeable items needing to be queried individually.

While there was no re-entry link, he wondered if he could spend points to enter completed challenge worlds.

[Prosperity above four thousand allows spending points to enter completed challenge worlds]

The system replied, though access required four thousand prosperity.

Nagasawa noticed the system mentioned entering completed worlds, not redoing challenges.

Given the choice, he’d revisit the Whitebeard challenge.

After succeeding, Kaguya was sealed. Fighting Naruto and Sasuke would be bullying. In the One Piece world, many strong opponents, especially pirates, committed heinous acts, making it guilt-free to fight them.

He looked forward to testing Kaido’s resilience against his sun-core-level flames and the Captain-Commander’s sword. He wondered if Big Mom’s abilities could counter Shinigami’s slashes.

However, the identity he’d assume, whether his own or a template, remained uncertain.

Beyond previous challenge worlds, he anticipated the Captain-Commander’s challenge.

Those cunning foes always used tricks, sealing Ryūjin Jakka or using decoys to steal Bankai.

Nagasawa would love to teach them a lesson, giving them a taste of fifteen-million-degree heat.

Thinking this, he recalled Kuro Zetsu, the shadowy manipulator.

Given the information from Kakashi’s template about Light Village, while its invasions of Iwagakure and Sunagakure were two years away, it couldn’t have become so aggressive immediately.

He instructed his intel-gathering Anbu to watch for new ninja villages.

While these disturbances wouldn’t affect Konoha or the Land of Fire, Nagasawa’s cautious nature meant he’d always be on guard.

Previously, upon learning from Obito about Kuro Zetsu’s plan to absorb the Hyuga and Uzumaki to perfect the Ōtsutsuki bloodline, Nagasawa temporarily barred any Hyuga or Uchiha from missions outside the village.

Though Obito was gone, Nagasawa believed Kuro Zetsu would help someone else. Uzumaki Nagato was also a Ōtsutsuki branch, and Kuro Zetsu might have involved him.

Fortunately, the Hyuga mainly handled village defence and rarely ventured out. They found the ban strange but had no objections.

The Uchiha, having been part of the police force, were transitioning to other roles but mainly worked within the village, also without objections.

Initially, rumours within the Uchiha suggested Konoha planned to suppress them. These were quickly quashed by Shisui, who detained the paranoid rumour-monger in Anbu’s prison, preventing any uproar.

This demonstrated Nagasawa’s prudence.

Any potential threat, even a one-in-ten-thousand chance, was addressed.

Seeing Ōtsutsuki in Kakashi’s template information, Nagasawa decided to accelerate his plans.

He would start guiding Sasuke and Naruto this year, ensuring they reached the six-path level faster than in the original story, contributing to Konoha’s prosperity.