Rebuilding Uchiha By Removing Fugaku

Toki always felt that the Ninjutsu Research and Development Center wasn't particularly useful.

After all, he was someone who had witnessed the pinnacle of ninjutsu research.

From simple techniques to Kekkei Genkai, then to Kekkei Tōta, and even to Kekkei Mōra and the Truth-Seeking Orbs.

No matter how advanced the ninjutsu, they were all rooted in chakra manipulation and the principles of Yin-Yang Release.

However, he now realized he had underestimated this system. As the power that shaped the world, Yin-Yang Release indeed encompassed all forms of ninjutsu.

But the system could take these concepts and manipulate them in ways he hadn't imagined.

Toki stared at the training scroll for the Light Release secret technique and realized it still operated within the framework of Yin-Yang Release.

Its principles included Yang Release, like the Hozuki Clan's Hydration Technique; Yin Release, akin to the materialization of the soul; and concepts similar to the Demonic Mirroring Ice Crystals technique. The training process wasn't beyond the ninja world's chakra system at all.

With the right elemental affinity or Kekkei Genkai, anyone could replicate the abilities of the Pika Pika no Mi through training—without any weaknesses.

The only drawback was the difficulty of mastering it.

An S-rank technique like this was as challenging as adding nature transformation to the Rasengan.

The Fourth Hokage himself had failed to complete the Rasenshuriken, and it took Naruto, a reincarnation of Asura, to barely succeed after relentless training.

To fully master this S-rank ninjutsu, it would likely take at least ten years.

Even Konan took over a decade to perfect her Paper Release secret technique.

While it wasn't impossible to create Light Release users in his clan using Devil Fruits, the exorbitant cost of 100,000 reputation points made that plan infeasible.

"Wouldn't it make more sense to upgrade the family building to level three first?" Toki muttered.

A building that only required 10,000 reputation points already felt so overpowered. What would a building that cost 100,000 reputation points be capable of?

Toki sighed.

"Too bad the family training ground only allows me to practice techniques I've already learned. I can't cheat my way through learning new techniques. If only there were a place specifically for learning..."

As he pondered this, inspiration struck him.

Learning?

Toki's eyes widened, and he quickly opened the system interface.

Sure enough, there it was: "Ninja School" listed among the family buildings.

He had almost forgotten. After Uchiha took control of the Ninja Academy, the system had incorporated the school as one of the family's buildings, similar to the Uchiha Ancestral Temple.

Toki clicked on the Ninja School's description:

[Ninja School: Greatly improves the efficiency of clan members learning ninjutsu.]

D-rank ninjutsu: 1 year

C-rank ninjutsu: 2 years

B-rank ninjutsu: 3 years

A-rank ninjutsu: 4 years

S-rank ninjutsu: 5 years

Forbidden-level techniques: 6 years

It was exactly as he expected.

The Ninja School building was designed to enhance learning efficiency. With its help, even an S-rank technique could be mastered within five years.

Toki's heart raced with excitement. This meant that the Uchiha clan's school-aged children could master at least one S-rank ninjutsu developed by the Ninjutsu Research and Development Center by the time they graduated.

By combining the Ninja School with the Ninjutsu R&D Center, he could create an army of clan members wielding "Devil Fruit" abilities—without weaknesses—within five years.

Toki's eyes sparkled with enthusiasm.

"This system is too perfect. Everything is interconnected!"

Resisting the temptation to rebuild the Ninja School right away, Toki turned back to the Ninjutsu Deduction function.

As the clan leader, he couldn't afford to spend five years back in school just to gain 100,000 reputation points. It made more sense to delegate the task.

Still curious about the system's limits, Toki smirked and typed something into the input box.

"Create a ninjutsu based on the Holy Grail System!"

The Light Release secret technique was still based on personal power. Toki suspected the system had far greater potential.

If the system could deduce ninjutsu using existing principles in the ninja world, why not attempt to replicate the Holy Grail System?

The Holy Grail System from the Moonlit World was based on the Third Magic—soul materialization—and combined vast amounts of magical energy with the summoning of heroic spirits from the Throne of Heroes. It could theoretically fulfill any wish of its host.

While it was primarily designed for magicians to access the Root of the World, its wish-granting abilities made it seem omnipotent.

Toki's grin widened as he imagined the possibilities.

Although the Moonlit World's Great Holy Grail wasn't truly omnipotent, it still possessed immense power.

If he could replicate something even remotely similar in the ninja world, it would be revolutionary.

The system responded with a series of prompts:

[Ding~ Holy Grail System Ninjutsu is being developed…]

Insufficient data. Estimated development time: 30 years.

Existing data found: Edo Tensei. Development time reduced by 10 years.

Materials needed to further reduce development time:

1. Spiritual Transformation Technique

2. Dragon Vein Energy or Grail Ore

Toki's excitement grew.

He stared at the requirements and muttered to himself,

"This… might actually be possible."