The damp, muddy air of Training Ground 44 was slowly cooling as the afternoon sun dipped lower behind the massive cedar trees.
Nanami was explaining the workings of the game to Nawaki. He tapped the heavy black scroll.
"This is the main scroll," Nanami explained, his tone shifting into something far more straightforward and accessible. "Think of the world inside this scroll as a massive, invisible tower. I have created exactly one hundred floors within it. Each floor is a completely different environment—endless deserts, freezing mountains, dark underground mazes—and each floor is filled with monsters and enemies that get stronger the higher you climb."
Nawaki stared at the scroll, the sheer scale of the creation dawning on him. "One hundred floors... Kento-niichan, the third floor almost broke my mind. What is at the top?"
"The absolute peak of our history," Nanami answered smoothly. "As you climb higher, the basic monsters are replaced by reconstructed phantoms of the world's most terrifying fighters. You will have to fight the Kages of the foreign nations. And, if you have the sheer willpower to reach the final floors, you will witness the true, unmitigated might of your grandfather's Wood Style with your own eyes."
Nawaki's breath hitched. His fatigue momentarily vanished, completely overwritten by a sudden, intense blaze of Senju pride. "Grandpa Hashirama is in there? I get to fight him?"
"You get to try and survive him," Nanami clarified. "But you cannot do it alone. The upper levels of this tower are impossible to clear by yourself, right now. You will need to form teams, or perhaps even lead entire battalions of shinobi, working perfectly together to clear the final floors."
"A battalion..." Nawaki's eyes widened as he imagined leading his friends into a massive battle. "But how? I was the only one in there. When can the others play? I have to show Shizuka and Hizashi! We could practice our squad formations!"
Nanami reached into his dark jacket. He withdrew a much smaller, standard-sized scroll. It was bound in white leather and marked with a simplified, elegant spiral seal.
"The main scroll remains in my possession," Nanami explained, tossing the smaller scroll to Nawaki. "It currently rests on a specialized pedestal carved from chakra-conductive timber in my basement. The wood acts as a physical anchor, pulling natural energy from the earth and feeding it directly into the ink to keep the entire illusion stable without draining my personal reserves."
Nawaki caught it, turning the smooth leather over in his hands, marveling at the intricate craftsmanship of the seal.
"That is an access scroll," Nanami said. "I have forged hundreds of them. As long as the main hub is active on its pedestal, a shinobi can unroll an access scroll anywhere within the borders of the Fire Nation, push their chakra into the seal, and drop their mind directly into the tower."
Nanami pointed a finger at the scroll in Nawaki's hands.
"Share that with your squad. If you and your friends want to fight together, all you have to do is agree on a secret password. If you speak the password and push your chakra into your scrolls at the exact same time, you will all wake up on the exact same floor together. You can train your formations, figure out how to cover each other's blind spots, and fight impossible odds without ever leaving the safety of the village walls."
Nawaki gripped the scroll, his mind immediately shifting gears. The lessons he had absorbed over the years were finally clicking into place. The reckless boy who charged blindly into danger was slowly being replaced by a calculating squad leader.
"If I take my team in..." Nawaki muttered aloud, his brown eyes sparking with sudden tactical clarity. "Hizashi's Byakugan could map the labyrinth floors and find the enemies before we even open the doors. Shizuka's chains could tie the bosses down, leaving them completely open for my Wood Style to block attacks and deliver the heavy strikes."
Nanami offered a small, approving nod. The boy was finally thinking like a commander.
"This is incredible," Nawaki whispered, looking back up, a hint of nervous apprehension returning to his eyes. "But... the pain. If Genin go in there and feel what it's like to be cut in half, it will break their minds before they even see a real battlefield."
"I have accounted for the fragility of the human mind," Nanami assured him. "When you enter the world, just focus your thoughts on the rules of the seal itself. You can actually choose how much pain you feel. You can dial it down so that a fatal sword strike only feels like a dull, annoying sting. It removes the trauma for beginners, though I highly recommend turning the pain back up as you advance, to ensure you do not develop reckless habits in a real fight."
Nawaki beamed, his boisterous enthusiasm finally breaking through his exhaustion. "Settings! You built pain settings into an illusion! Kento-niichan, you're a genius! I'm going to take my team to the tenth floor by next week!"
He tried to push himself up from the roots of the cedar tree, eager to run and find his teammates, but his legs instantly buckled. His chakra coils were empty, the physical toll of his real-world training catching up to him the moment his adrenaline faded.
Nanami caught him by the shoulder, hauling the heavy teenager upright and draping Nawaki's arm over his own neck to support his weight.
"Ambition must bow to biology, Nawaki," Nanami sighed. "Your stamina is entirely depleted. You are coming back to my house. You will consume a heavily caloric dinner to rebuild your cellular energy, and then you will sleep. The tower will still be there tomorrow."
"Fine," Nawaki grumbled, though his stomach growled loudly in agreement. "But I'm eating at least three bowls of rice."
"Four, if you expect your muscles to recover from the phantom tension."
The Senju-Nanami residence was filled with the rich aroma of roasted vegetables and simmering beef broth.
The dinner was a loud, chaotic affair. Nawaki inhaled his food with the ravenous, terrifying appetite of a growing Senju, pausing only to excitedly recount his battle with the Kobold Lord to his sister, gesturing wildly with his chopsticks to emphasize the size of the beast's hammer.
Tsunade, sitting beside Nanami, listened to her brother's tale with a mixture of intense curiosity and fierce pride. Her left hand rested gently over the pronounced swell of her stomach.
When the meal was finished and Nawaki had practically crawled to one of the guest rooms to collapse into a deep sleep, Nanami cleared the low wooden table. He brought out the master scroll and a handful of the white access scrolls.
Tsunade leaned forward, her golden eyes gleaming as she inspected the dense, elegant sealing scripts.
"A shared training ground with adjustable pain limits and scaled physical feedback," Tsunade summarized, tracing the edge of an access scroll with her finger. "Kento, this completely revolutionizes military training. We can run mass-casualty scenarios without spilling a single drop of actual blood. I want to test the higher floors. Program a fight with the Raikage. I want to see if I can shatter his lightning armor faster than you did."
She reached for the access scroll.
Nanami smoothly slid the scroll across the table, pulling it entirely out of her reach.
Tsunade blinked, her brow furrowing. "Excuse me?"
"You are restricted from entering the Training ground," Nanami stated, his voice carrying the firm, unyielding tone of absolute authority.
"Restricted?" Tsunade's eyes flashed dangerously. "I am a Sannin, Kento. I am the foremost medical expert in the village. I do not require permission to utilize a training tool."
Nanami did not flinch under her glare. He reached out, gently placing his large, calloused hand over the swell of her stomach.
"You are currently pregnant, Tsunade," Nanami explained softly, his sea-green eyes holding hers. "The Crucible is not a simple genjutsu. It overrides the nervous system to simulate reality. If you engage in high-level combat within the matrix, your brain will process the adrenaline, the stress, and the phantom trauma as absolute truth."
Tsunade stared at him, the fierce, competitive fire in her eyes slowly dimming as the irrefutable medical logic of his statement settled in. She let out a heavy sigh, her shoulders dropping in concession.
"You are right," Tsunade muttered, resting her hand over his. "The sudden spike in cortisol and adrenaline from experiencing a simulated fatal blow could cause severe placental abruption or premature contractions. The physiological shock is too much of a risk right now."
"It is a biological hazard I am entirely unwilling to take," Nanami nodded, gently rubbing his thumb against her tunic.
"Fine," Tsunade grumbled, her lower lip jutting out in a rare pout. "I concede the medical point. You win, Doctor Nanami. But the moment I deliver this baby and my chakra coils stabilize, I am taking a squad into the simulation, and I am going to punch the Cursed Sword Saint into a pile of ash."
"I will personally program him to wait for you," Nanami smiled warmly, leaning over to kiss her forehead.
The night drew on, filled with the quiet, domestic warmth of their shared home. But the relentless march of duty meant the next morning arrived far too quickly.
The sky over Konoha was bright and clear.
Nanami Kento walked into the Hokage Tower. The guards saluted him sharply as he bypassed the administrative desks and ascended directly to the highest floor.
He entered the Hokage's office. Kagami Uchiha was standing by the window, reviewing a supply line report, his dark eyes looking significantly less burdened than they had during the tense days of the border wars.
"Kento," Kagami greeted, turning around. "Good morning. You have the look of a man attempting to overhaul my training regiments."
"Good Morning Sensei," Nanami replied, walking to the desk and placing the heavy, black master scroll and a single white access terminal on the polished wood.
Kagami looked at the scrolls. He recognized the dense, terrifying complexity of the sealing matrix immediately. "What is this?"
Nanami gave a concise, precise briefing of the game-like illusion. He explained the passwords, the climbing difficulty, the pain settings, the mass capacity, and consequence-free squad training.
Kagami listened in stunned silence. The tactical applications of such a device were staggering. It would allow Genin to experience the terror of an S-rank missing-nin without dying. It would allow Jonin to test siege tactics against fortified positions without expending a single explosive tag or risking a single life.
"It sounds impossible," Kagami whispered, picking up the white access scroll. "A perfectly rendered reality, sustained entirely by ambient natural energy."
"It is merely an extreme application of Yin Release," Nanami corrected. "It gives form to imagination. I request that you test it, Hokage-sama. You must ascertain its value before we distribute the access scrolls to the military academy and the active duty rosters."
Kagami's dark eyes sparked with genuine curiosity. "Very well. How do I begin?"
"Unroll the white scroll. Place your hand upon the central seal. Focus your chakra into the lock. I will remain here to monitor your physical body."
Kagami sat back down in his heavy leather chair. He unrolled the scroll, bit his thumb purely out of habit, and pressed his palm against the seal, surging his potent Uchiha chakra into the ink.
The script flared blue. Kagami's body went completely limp, his head lolling back against the chair, his consciousness instantly dropping into the tower.
Nanami pulled up a secondary chair, crossing his legs and pulling a small book from his pocket. He settled in to wait.
Two hours passed in complete silence.
Suddenly, Kagami Uchiha gasped violently.
His eyes snapped open. He threw himself forward, his hands instinctively coming up to guard his chest, knocking his ink stone and several reports off the desk in a clattering mess.
He was sweating profusely, his chest heaving as he stared wildly around the familiar, sunlit office.
Nanami closed his book with a soft snap.
"Welcome back to the physical plane, Lord Third," Nanami said evenly. "Your heart rate is currently elevated by forty percent. I assume you did not lower the pain settings?"
Kagami slumped back into his chair, wiping a trembling hand across his sweat-drenched forehead. He let out a long, ragged exhale, forcing his Sharingan to deactivate. The absolute terror faded, replaced by a shuddering awe.
"It is flawless," Kagami rasped, staring at his trembling hands. "The scent of the burning wood. The weight of the air. The terror of the killing intent. It feels completely real."
Nanami smiled faintly. "Did you reach the highest floors?"
"I skipped the lower levels," Kagami admitted, wiping his mouth. "I commanded the scroll to drop me into a higher-level fight. I wished to test the absolute limits of the enemies inside."
"A bold choice," Nanami noted. "And who managed to break the Hokage?"
Kagami let out a dry, incredulous laugh, shaking his head slowly.
"I was defeated by my own ghost," Kagami confessed, a mixture of horror and deep respect in his voice. "A flawless, ruthless replica. It possessed my exact speed, my exact mastery of Fire Style, and a Sharingan that read my movements perfectly. I fought myself for forty minutes before it outsmarted me. The copy used a specific, obscure Uchiha shuriken-wire trap that I invented myself but rarely use in practice. Realizing the simulation had perfectly replicated my own tactical genius is what ultimately broke my focus. It drove a blade through my spine before I could counter."
Nanami chuckled, a low, rumbling sound. "The mirror match is designed to be the ultimate test of adaptability. If you cannot break your own established patterns, the copy will execute you with terrifying speed."
"It is a masterpiece, Kento," Kagami declared, the exhaustion in his face replaced by the fierce, calculating fire of a village leader. "Who else is waiting on the upper floors?"
"The historical accuracy is absolute," Nanami reported. "The scroll holds the memories and combat data of the current and former Kages from all five Great Nations. Lord Hashirama and Lord Tobirama are fully realized. Madara Uchiha is present. The Tailed Beasts roam the specific wasteland levels. Additionally, I have programmed the combat data of our current vanguard—Sakumo, Tsunade, Duy, Orochimaru, Jiraiya, and myself."
Kagami leaned forward, resting his elbows on the desk. "This will elevate the baseline strength of our forces by an astronomical margin. Our Genin will enter real combat with the experience of seasoned veterans."
The Hokage reached for his official stamp.
"I authorize the immediate mass production and distribution of the access scrolls to the Academy instructors, the ANBU training division, and the active Jonin commanders," Kagami ordered. "I will give you a 20% tax cut on it."
"I appreciate the financial support, Lord Third," Nanami bowed his head respectfully, gathering the master scroll and placing it back into his jacket. "The logistics division will receive the first shipment of scrolls by the end of the week."
Nanami turned to leave, but paused near the heavy oak doors.
"A minor inquiry, Sensei," Nanami asked, glancing back over his shoulder. "Have you received any reports regarding Jiraiya? Tsunade mentioned he has been absent from the village for a while."
Kagami's expression softened into a fond, slightly exasperated smile.
"Jiraiya sent a messenger toad to the tower three days ago," Kagami explained. "With Hanzo dead, slain by your team, the Land of Rain is still deeply destabilized. The sudden removal of their warlord has left the country fractured. While traversing the war-torn sectors near the border, Jiraiya encountered two young war orphans. He requested formal permission to bring them across the border and integrate them into Konohagakure, citing their immense potential and their tragic circumstances."
Nanami's eyes narrowed slightly, a spark of intense, calculating focus igniting in his mind.
"Two orphans?" Nanami clarified.
"Yes," Kagami nodded. "A boy and a girl. Given that the borders are currently stable and we are expanding our civilian infrastructure, I approved his request. He is currently escorting them back."
Kagami leaned back, his gaze turning serious. "I will have Yamanaka clan not only screen them for trauma upon arrival but explicitly search their minds for sleeper seals or subconscious espionage triggers planted by Hanzo's remnants. We are compassionate, but we are not foolish. The security of the village remains our primary concern."
"I see," Nanami murmured. "A necessary precaution. Thank you, Lord Third. Good day."
Nanami exited the Hokage Tower, stepping out onto the bustling, sunlit streets of Konoha.
He walked at his usual, unhurried pace, his hands tucked loosely into his pockets. But beneath his relaxed exterior, the vast, intricate network of his knowledge was rapidly rearranging itself, processing a timeline alteration of massive, continental proportions.
Two orphans, Nanami analyzed, his mind working with cold, absolute precision. Not three.
In the original, tragic history of this world, Jiraiya had remained in the weeping lands of Amegakure to train three desperate children: Yahiko, Konan, and Nagato. He had trained them to survive because the world was cruel, and the Hidden Leaf was a distant, uncaring military power that had killed their parents in the crossfire.
But in this timeline, Nanami realized, the pieces clicking flawlessly into place. The Uzumaki clan was not annihilated. They were integrated.
Nagato, the boy who possessed Madara's Rinnegan, the child of Uzumaki refugees who had fled to the Rain Village in the original timeline to escape the slaughter of their homeland... had never fled. Because Uzushiogakure had been saved. The clan had migrated safely to the Hidden Leaf.
A sudden, vivid memory surfaced in Nanami's mind. A few weeks ago, at his parents' bakery. He remembered seeing a quiet, red-haired boy nervously buying sweet bread, flanked by protective, doting Uzumaki elders who ensured he lacked for nothing.
Nagato's parents had not been murdered by starving Konoha shinobi looking for food in a war zone. They were currently living in the eastern sector of Konoha, maintaining the village barriers and working peacefully in the community.
Nagato was not a starving orphan in the rain. Nagato was a well-fed, protected child, currently attending the Konoha Ninja Academy right alongside Akira and Kushina.
And because Kagami Uchiha is a Hokage, Nanami continued his deduction, a deep sense of satisfaction settling into his bones. Jiraiya could not hide in the mud for three years to teach Yahiko and Konan how to survive. He simply asked permission to bring them home.
The orphans of the Rain were coming to the Leaf. They would be fed. They would be trained in the light.
Nanami Kento looked up at the clear blue sky, a genuine, relaxed smile spreading across his face.
The Akatsuki—the organization born of grief, pain, and the desperate desire to force peace through suffering—had been aborted before it could even draw its first agonizing breath.
The ghosts of the past were being systematically erased, replaced by a future built on logic, compassion, and overwhelming strength. The board was completely secure.
True victory wasn't winning a war. It was preventing the enemy from ever being forged in the first place.
"Practicality," Nanami whispered to the wind, his boots carrying him back toward his family. "It truly solves everything."