Konoha's Tatsuya

The reason Tatsuya wanted to develop a chakra-sealing jutsu similar to the Strength of a Hundred Seal was to drastically increase his strength in a short amount of time.

In the ninja world, pure taijutsu specialists like Might Guy and Rock Lee were rare exceptions. The main criterion for evaluating a ninja's strength was the amount of chakra in their body. The amount of chakra a ninja possessed not only determined the power of the ninjutsu they could use but also affected their combat endurance. It was a key factor in determining the outcome of a battle.

In a fight, "tons of chakra" users like Jinchuriki and Kisame could unleash large-scale ninjutsu without restraint, demonstrating immense power whether in one-on-one combat or on the battlefield. Those like Kakashi, who had an ordinary constitution and were further restricted by the Sharingan, often had to rely on strategy and precise chakra utilization. After a tough battle, even if they weren't injured, they'd be exhausted for days.

Because the amount of chakra an individual ninja could possess was limited, and chakra, as a form of energy, was difficult to store, the number of ninja who could possess "tons of chakra" was extremely small. They were basically all "cheaters"!

As far as Tatsuya knew, the only ninjutsu in the entire ninja world that could solve the problem of chakra storage was the Strength of a Hundred Seal. This was an S-rank support-type sealing jutsu that allowed a ninja to accumulate a large amount of chakra over a long period of time. At a critical moment in battle, releasing the seal would grant them a massive surge of chakra.

It was because she possessed the Strength of a Hundred Seal that Tsunade could use Creation Rebirth and the Strength of a Hundred Technique.

For Tatsuya, with the Fujinhoin and the Body Activation Secret Technique, the speed of chakra refinement was no longer the key factor limiting his rapid strength growth. The limiting factor was the maximum chakra capacity of his young body. Although this capacity was constantly increasing as Tatsuya grew and his physique improved due to the Body Activation Secret Technique, this growth still took a long time and wouldn't allow Tatsuya to reach a certain level of power in a short amount of time.

A chakra-sealing jutsu like the Strength of a Hundred Seal was the best solution. With the powerful functions of the Fujinhoin, Tatsuya could go all-out in battle and then quickly recharge, maintaining a strong combat capability for an extended period.

Moreover, there was one crucial point: Tatsuya wanted to learn Senjutsu. Senjutsu was the ladder that could help Tatsuya take a leap and join the ranks of the top combatants in the ninja world.

After obtaining the Ryuchi Cave's Senjutsu scroll from Orochimaru, Tatsuya had eagerly begun to study it. After analyzing the Ryuchi Cave's Senjutsu training method, Tatsuya discovered three key points to using Senjutsu. The reason why so few ninja in the ninja world knew Senjutsu was primarily because the learning conditions were too harsh.

First, and this was where basically ninety-nine percent of ninja were stuck, was sensing natural energy. Without the assistance of the sages of the three great Sage Regions, it was extremely difficult for humans to sense and absorb natural energy on their own. Currently, only Jugo could do this naturally in the entire ninja world. Both Jiraiya and Naruto learned Senjutsu with the help of Fukasaku.

Second, the key to learning Senjutsu was the ninja's chakra control. Normally, a ninja uses the chakra within their body to activate ninjutsu. Ordinary chakra is obtained by mixing one's physical energy and spiritual energy. Senjutsu chakra, on the other hand, is formed by absorbing and completely merging natural energy on top of this.

However, to maintain the balance of these three energies, each must constitute one-third. If natural energy exceeds one-third, the user will be swallowed by natural energy, and their body will begin to petrify. If it's less than one-third, Sage Mode cannot be activated.

The third key point was the amount of chakra the ninja possessed. For the purpose of simply learning Senjutsu, it seemed that achieving the first two points would be enough to learn and use it. But in actual combat, the amount of chakra a ninja possessed was also a crucial factor in whether they could use Senjutsu.

Because the vast majority of Senjutsu were powerful ninjutsu, their consumption of Senjutsu chakra was significant. If a ninja wanted to maintain Sage Mode, they needed to have a large amount of chakra in their body to ensure that the three energies didn't become unbalanced. Otherwise, they could easily fall victim to the erosion of natural energy.

This was evident in the case of the Fourth Hokage, Minato Namikaze. As Jiraiya's disciple, Minato Namikaze had learned Senjutsu, but before his death, he rarely used it in actual combat. Even with the Hiraishin (Flying Thunder God Technique), an incredibly powerful skill, the boost Senjutsu would have provided to Minato's combat power was still terrifying. The main reason Minato didn't use it was that he didn't have enough chakra. Using Senjutsu would significantly reduce his combat endurance. However, during the Fourth Shinobi World War, after obtaining the Nine-Tails Mode from inside the Shinigami's stomach, Minato Namikaze was able to instantly activate Sage Mode on the battlefield.

To learn Senjutsu, Tatsuya currently met none of the three conditions. Tatsuya could use shadow clones to continuously grind experience and improve his chakra control, but he had no good solutions for sensing natural energy or increasing his chakra reserves for the time being.

Tatsuya wanted to solve the chakra quantity problem first. With sufficient chakra, even if he still couldn't learn Senjutsu, his strength would still be greatly enhanced. Tatsuya used his bio-chip to make an estimate. At his current growth rate, if he wanted to learn and use Senjutsu through normal means, it would probably take him three or four years to reach the standard. This was why Tatsuya was so eager to develop a knock-off version of the Strength of a Hundred Seal.

The fastest way to develop a knock-off version of the Strength of a Hundred Seal was to copy the original. However, this was impossible for Tatsuya. The Strength of a Hundred Seal was an S-rank support-type sealing jutsu. Throughout the entire Naruto story, its users were only Mito Uzumaki, Tsunade, and Sakura Haruno, making it a secret technique passed down through a master-disciple lineage.

The training method for the Strength of a Hundred Seal was currently only known to Tsunade. Konoha's secret archives probably didn't have a training scroll. Otherwise, given the personalities of Danzo and Orochimaru, they wouldn't have ignored such a powerful ninjutsu. Even if Konoha's secret archives did contain a training scroll for the Strength of a Hundred Seal, given Tatsuya's current status and contributions to the village, it would be practically impossible for him to obtain it.

However, after some thought, Tatsuya had a preliminary idea. He would start his research with summoning jutsu and contract seals.

The essence of chakra was the combination of physical energy and spiritual energy. To store chakra, one had to be able to store both of these energies. The Akimichi clan's secret techniques had clever methods for storing physical energy, so overcoming this wouldn't be difficult for Tatsuya.

As for spiritual energy, Tatsuya had previously discovered runes similar to those used for storing spiritual will in summoning contracts. Moreover, contract seals could directly sever the contract between a ninja and their summoned creature, indicating that they contained runes that could prevent spiritual will from permeating or escaping.

If he could replicate the runes related to spiritual will from summoning contracts and contract seals, he might be able to create a new sealing jutsu. Once the problem of storing spiritual energy was solved, storing chakra would no longer be difficult.