The Hokage Tower was the bureaucratic heart of Konoha. It was a place of endless forms, stamped permits, and the crushing weight of administrative responsibility.
To Nanami Kento, it felt like home.
He walked up the stairs to the reception desk, his Academy bag slung over one shoulder. The secretary, a Chunin with tired eyes and ink-stained fingers, looked up from a mountain of mission reports.
"Name and business?"
"Nanami Kento," he replied, adjusting his collar to ensure perfect symmetry. "I have an appointment to claim a mission reward from the Lord Hokage."
The secretary blinked, scanning a ledger. "You're the first-year student the Hokage mentioned? Go right in. He's expecting you."
Nanami walked to the double doors. He took a deep breath, composing his features into a mask of professional deference.
Knock. Knock.
"Enter."
Tobirama Senju sat behind a desk that was barely visible under stacks of paperwork. He looked like a man under siege, fighting a war not with kunai, but with red ink and budget deficits.
"Nanami," Tobirama said, not looking up from a report on the village's sewage infrastructure. "You are punctual."
"Time is a non-renewable resource, Lord Second."
Tobirama finally looked up, setting his pen down. The ghost of a smile touched his lips. "Indeed. You are here to claim your reward for the Rasengan submission. Have you decided? A Water Style technique? Perhaps a sensory jutsu to complement your Fuinjutsu?"
Nanami stood straight. He looked Tobirama in the eye.
"I want the Flying Thunder God."
The room went silent. The air pressure dropped noticeably as Tobirama's gaze sharpened into a glare that could freeze water.
"The Hiraishin," Tobirama said slowly, his voice dropping an octave. "That is an S-rank Space-Time Ninjutsu. It is forbidden. It is theoretically complex, chakra-intensive, and lethal if miscalculated. Teleporting into a solid object is a messy way to die, Nanami."
"I am aware of the risks," Nanami stated without flinching. "However, I have spent the last six months mastering the fundamental logic of Fuinjutsu under Lady Mito. Hiraishin is not a standard Ninjutsu; it is a summoning technique applied to the self. It is Fuinjutsu in motion. I believe I have the requisite foundation."
Tobirama leaned back in his chair. He scratched his chin, his red eyes analyzing the boy.
He had heard the reports from Mito. The boy was a prodigy in sealing arts—a freak of nature who saw seal scripts as equations rather than art. He had reinvented barrier theories, optimized explosive tags, and created noise-canceling privacy seals. If anyone could understand the nightmare mathematics of Hiraishin, it was this six-year-old.
"It is the ultimate tool for efficiency," Nanami added, sealing the deal with the word he knew Tobirama respected. "It eliminates travel time. It negates distance. It turns a three-day mission into a three-minute trip."
Tobirama's lip twitched. Efficiency. The boy spoke like a logistician, not a warrior.
"Fine," Tobirama decided. "But the scroll does not leave the Senju compound. It is too dangerous to be wandering the streets of Konoha. I will instruct Mito to provide you with the source material during your evening sessions. You learn it there. You practice it there."
"Understood, Lord Hokage."
"Dismissed."
That evening, the atmosphere in Mito's study was heavy with anticipation.
Mito placed a black scroll on the table. It didn't have a standard tie; it was sealed with a physical lock that required a specific chakra frequency to open.
"Hiraishin," Mito said reverently. "My husband's brother created this during the Warring States Era. It turned the tide of many battles."
Nanami opened the scroll.
It was dense. It wasn't just hand signs; it was pages and pages of formulae. Spatial coordinates, chakra frequency modulation, dimensional anchoring. It looked less like magic and more like advanced physics written in calligraphy.
"Let's get to work," Nanami whispered, dipping his bone brush.
For the first week, Nanami didn't try to use the jutsu. He didn't try to teleport a pebble or a leaf. He just read. He had his clones memorize different sections, cross-referencing the data, building a structural model of the jutsu in his mind.
He realized quickly that Tobirama's Hiraishin was... unrefined.
It's a prototype, Nanami analyzed, tracing the formula for the spatial marker. The script is excessive. The activation sequence requires a specific hand sign to trigger the jump unless you have massive chakra control. The marker itself is complex, requiring a lot of ink or a heavy chakra imprint.
It was brilliant, but it lacked polish. Tobirama had built it to work in the chaos of war; he hadn't built it to be seamless.
I can fix this, Nanami thought, his eyes narrowing as he looked at a redundancy in the dimensional vector calculation. I can streamline the formula.
He spent the next month ignoring the "how to use" section and focusing entirely on the "how to build" section.
He sat with Mito, arguing about spatial vectors late into the night.
"The formula relies on a static anchor," Nanami argued, pointing to the scroll with ink-stained fingers. "It treats the destination as a fixed point. But the world is moving. That's why the chakra cost is so high—the jutsu is constantly calculating the drift."
"And your solution?" Mito asked, fascinated by the intensity in his eyes.
"Resonance," Nanami said. "Don't anchor to the ground. Anchor to the seal itself. Create a spiritual link between the user and the mark. If I am 'A' and the mark is 'B', I don't need to know where 'B' is. I just need to know that 'A' and 'B' are magnetically pulled toward each other."
He dipped his brush.
"I'm rewriting the marker formula. Compressing it. Making it lighter."
Two months passed.
Nanami's daily routine became a grueling cycle of physical conditioning and mental gymnastics. His 3,000 punches kept his body sharp, but his mind was lost in the dimensional theory.
His clones at the Academy were on autopilot, barely scraping by with generic answers while the main processor—Nanami's brain—was burning calories solving spatial geometry.
Finally, a rainy Tuesday evening arrived.
Tobirama Senju entered Mito's study. He had finished his duties early and wanted to check on the boy's progress. He expected to see Nanami struggling with the first jump, perhaps managing to teleport a few feet with great effort.
Instead, he found Nanami standing in the center of the room, holding a strange, three-pronged kunai. The handle was wrapped in tape, marked with a simplified, elegant script that Tobirama didn't recognize.
"Lord Second," Nanami greeted, bowing.
"You modified the kunai," Tobirama noted, eyeing the weapon. "Balance adjustment?"
"Formula adjustment," Nanami corrected. "The standard kunai has too little surface area for your original seal. I redesigned the handle to accommodate a condensed script."
"Condensed?" Tobirama frowned. "You cannot compress spatial coordinates. The formula is immutable."
"Everything can be optimized, sir."
Nanami tossed the kunai.
It sailed across the room, embedding itself in the wooden post near the door.
Tobirama watched. He waited for Nanami to perform the hand seal—the Tiger seal required to activate the chakra bridge in his original version.
Nanami didn't move his hands. He just stood there.
Zip.
There was no sound of rushing wind. No blur of movement.
One millisecond, Nanami was in the center of the room. The next millisecond, he was holding the handle of the kunai embedded in the wall.
Tobirama's eyes widened. Instant. He bypassed the activation latency. He removed the hand seal.
Nanami pulled the kunai out and spun it on his finger. "Reaction time: zero point one seconds. Chakra consumption: reduced by thirty percent due to the optimized marker script."
Suddenly, Tobirama moved.
He didn't speak. He didn't warn. He reached into his pouch and whipped a shuriken directly at Nanami's head. It was fast—Jonin speed.
Mito gasped.
Nanami didn't flinch. He didn't try to dodge physically.
He threw the marked kunai into the air above him.
Zip.
Nanami vanished.
Thunk.
The shuriken buried itself in the wall where Nanami's head had been a fraction of a second ago.
Zip.
Nanami reappeared in mid-air, catching the kunai he had thrown, and landed gracefully on the tatami mats.
"Test successful," Nanami said calmly, though his heart rate had spiked. "Though I would appreciate a warning next time, Lord Second."
Tobirama lowered his hand. A rare look of genuine astonishment crossed his face.
"You rewrote it," Tobirama whispered. "In two months. You rewrote my life's work."
"I stood on the shoulders of a giant," Nanami said diplomatically. "I merely adjusted his posture."
Tobirama walked over and took the kunai. He examined the seal. It was elegant. It flowed like water, using the natural curvature of the handle to loop the chakra back into itself.
"This isn't just an improvement," Tobirama muttered. "It is an evolution."
He looked at the boy.
"You studied my other jutsu as well," Tobirama said. "Shadow Clone. Water Dragon. Hiraishin."
"I have analyzed them, yes."
"Do you notice a pattern?"
Nanami nodded. In his mind, the pieces clicked together.
Shadow Clone creates decoys to confuse the Sharingan's visual prowess. Hiraishin moves faster than the Sharingan can track. Edo Tensei turns the dead into unkillable soldiers to psychologically break opponents who rely on emotion.
They are all counters, Nanami realized internally. Specifically, counters to the Uchiha clan. Tobirama Senju didn't just fight a war; he engineered a solution to a specific enemy.
But out loud, Nanami simply said, "They are all designed to seize the initiative. They force the opponent to react to you, rather than you reacting to them. They disrupt the enemy's rhythm."
Tobirama stared at him. He saw the intelligence in the boy's eyes. He suspected Nanami knew exactly who the jutsu were meant for, but the boy had the wisdom not to speak it aloud.
"Correct," Tobirama said. "They are tools of control."
He placed the kunai back on the table.
He looked at Nanami.
"You are an inventor. You look at a technique, and you do not as,k 'How do I use this?' You ask 'how do I make this better?' You see the flaws in the system."
Tobirama extended his hand.
"I need minds like yours, Nanami. Not just soldiers who follow orders, but architects who can build the future."
"Nanami Kento. I am formally offering you the position of my personal disciple. You will learn strategy. You will learn administration. And you will learn every jutsu I have ever created, and you will improve them until they are perfect."
Nanami looked at the hand.
This was it. The ultimate promotion. Direct mentorship under the creator of Konoha's infrastructure.
"What are the expectations?" Nanami asked.
Tobirama smirked. "Perfection. And secrecy. And a lot of paperwork."
"Then I accept," Nanami said, shaking the Second Hokage's hand. "But I will require access to the forbidden library for research purposes."
"Agreed."
Mito clapped her hands together. "Wonderful! Now that the boys are done posturing, sit down. Tea is getting cold."
Nanami sat. He looked at the kunai on the table. He looked at his new master.
Mito for the Soul. Tobirama for the Mind. Netero for the Body.
He picked up his tea. It was still hot, thanks to the vacuum seal he had placed on the cup earlier.
Efficiency, Nanami thought, taking a sip. It really is the only way to live.