A Shaman from the Uzumaki Clan in the World of Naruto

Although Reiji could still learn Intermediate and Advanced Level Fuinjutsu, most of those techniques were defensive or supportive—something that wasn't particularly needed for Reiji at the moment, who was more interested in offensive capabilities.

Reiji sat lost in thought in his room, staring blankly at the ceiling, boredom haunting his mind.

A moment later, an idea popped into Reiji's head, and a cheerful smile lit up his face.

"If there are no materials to use, why not create the materials myself?" Reiji murmured.

With renewed enthusiasm, Reiji immediately headed to his Underground Space.

The room had already become an experimental area filled with various tools and materials.

However, this time, Reiji had a grand plan.

Instead of digging deeper to expand the space, Reiji decided to try using Space Fuinjutsu to magically enlarge the area without needing to excavate the ground.

As he contemplated the changes he would make, Reiji reflected.

He began to think about Storage Scrolls, a tool that uses Fuinjutsu to store and seal inanimate objects.

Until now, these scrolls had only been used for storing items.

But Reiji wondered, why limit it to that?

"What if I could make this room bigger using the same principles?" Reiji thought.

Reiji began to envision the use of Space Fuinjutsu to enhance the capacity and flexibility of the space, creating a way to add dimensions within the underground area.

That was why Reiji started to delve into and understand the principles of Storage Scrolls.

With that understanding, Reiji attempted to apply a similar effect to the Underground Space of his home.

Instead of just being able to store inanimate objects like the Storage Scrolls, Reiji decided to make the place capable of accommodating living beings, transforming it into a much larger and more useful space.

...

Reiji took more than a month to complete this major project.

During that time, Reiji spent his days experimenting, calculating dimensions, and designing complex Fuinjutsu to ensure the space remained stable.

Although the process was incredibly exhausting, the end result was worth the effort.

The Underground Space now had an area of about two hundred square meters, a significant change that gave Reiji the freedom to develop more things.

However, there were important limitations to adhere to.

Reiji knew that if he tried to expand the space beyond that, the structure of the Underground Space could become unstable.

In fact, there was the worst-case scenario of a dangerous spatial explosion, or even Space Distortion—a phenomenon that could turn the surrounding reality into chaos.

Reiji was very aware of these risks; even though he was intelligent and strong in his previous life, tampering with aspects of Space and Time was not something to be taken lightly.

Even the smallest mistake could lead to terrible consequences.

With those limitations in mind, Reiji began to organize and design the rooms within the Underground Space.

The first and most important was the Training Room.

This area was specifically designed to maximize physical abilities and chakra energy.

After the Training Room was completed, Reiji began working on the second room, the Research Room.

This room was equipped with various experimental tools, work tables, and shelves filled with scrolls, materials, and Fuinjutsu equipment.

However, the most important aspect of this room was the complex safety sensor system.

Reiji created a special Fuinjutsu that functioned like an advanced security protocol; if Reiji was in danger, this system would forcibly evacuate him from the room.

If the evacuation process could not be completed in time, an automatic shield would be activated to protect Reiji from any threats.

Building the Research Room took longer than the Training Room.

Reiji had to study and implement highly complex Fuinjutsu to ensure that this sensor system worked perfectly.

------------------------------

[Announcement: A New Novel Has Been Added!

Marvel: The Sorcerer in America

Lance White is not an ordinary human. His body is a manifestation of the power of a Super Saiyan, while his soul is an unexpected combination of a Shinigami and a mutated Arrancar, granting him unparalleled spiritual strength. With Poseidon Scale Armor protecting Lance's body and The God Killer Sword and Trident of Neptune in his hands, Lance fulfills his destiny as a hunter of darkness.

In a world filled with heroes and supernatural threats, Lance hunts the most sinful villains on earth—creatures too evil to be forgiven—and navigates the realms of hell to defeat the unimaginable terrifying monsters.]

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