He was five years old when he broke the tutorial.
Not intentionally. Kenji had a plan — a careful, measured, appropriately paced plan that involved gradually demonstrating chakra sensitivity at a rate that would read as gifted-but-explainable to two of the most perceptive people in the entire shinobi world. He had drafted it mentally over the course of three years. He had accounted for variables.
He had not accounted for Naruto.
His brother had been born eight months ago, and the house had not been quiet since. Naruto operated at a single volume — maximum — and at a single emotional intensity — also maximum — and he had somehow, in less than a year of existence, completely reorganized the household's center of gravity around himself. Kushina was besotted. Minato smiled more than Kenji had ever seen him smile. Even the ANBU stationed outside the house occasionally broke protocol to peek through the window when Naruto laughed.
Kenji loved him immediately and completely and with a ferocity that surprised him.
He had not expected that. In his previous life he had been an only child, solitary by circumstance and eventually by habit. He had not known he was capable of this specific feeling — this particular combination of protectiveness and exasperation and something so tender it almost hurt — until a round-faced, orange-chakra-radiating infant had arrived and simply claimed him.
Naruto grabbed everything within reach. This was his primary hobby.
On the morning that broke the tutorial, Naruto had grabbed Kenji's practice block — a small cube of chakra-conductive wood that Minato had given Kenji for sensing exercises — and had immediately put it in his mouth. Standard Naruto procedure. Kenji had retrieved it, wiped it, and set it on the table above Naruto's reach.
Naruto had looked at him with absolute betrayal in his blue eyes.
Then he had started crying.
Not distress-crying. Naruto had different cries for different things and Kenji had catalogued all of them by month three. This was the one Kenji internally labeled as tactical deployment — sustained, melodic, perfectly calculated to bring Kushina from wherever she was in the house within approximately forty-five seconds.
Kenji had forty-five seconds.
He picked up the practice block and sat cross-legged on the floor in front of his brother, holding it out. "You can have it back," he said, in the careful measured speech of a five-year-old who had been speaking in complete sentences since age two and had learned to tone it down, "if you stop."
Naruto stopped crying. He looked at the block. He reached for it.
Kenji held it just out of reach. "Sit up first."
Naruto, eight months old, was not reliably sitting up yet. But he wanted the block. He pushed himself upright with enormous effort, wobbled, stabilized, and looked at Kenji with an expression of pure triumph.
Kenji handed him the block.
Naruto grabbed it, examined it, and then — just to be sure Kenji understood the transaction had been completed on Naruto's terms — threw it directly at Kenji's face.
Kenji caught it on reflex.
The moment his fingers closed around the block, something moved. Not physically — inside. A current that ran up from his palms and branched outward through his chest, his arms, the base of his skull. He had been doing controlled exercises with this block for two months, carefully releasing small measured amounts of chakra into it the way Minato had shown him, at a level appropriate for a gifted five-year-old.
What moved through him now was not measured. It was the full current, unrestricted, responding to the sudden motion and the spike of adrenaline from the catch, and the block in his hand lit up like a lantern.
Blue-white. Bright. Very, very visible.
The room went quiet.
Naruto stared at the glowing block with his mouth open.
Kenji stared at his own hands.
Then, in the upper corner of his vision:
[CHAKRA FLOW INITIATED — UNCONTROLLED RELEASE DETECTED]
[TUTORIAL QUEST COMPLETE — AHEAD OF SCHEDULE]
EXP Gained: 500
LEVEL UP — Level 1 → Level 2
System Points Gained: 200
Skill Tree: UNLOCKED
New Feature Unlocked: SYSTEM SHOP — Full Access
The block stopped glowing the moment Kenji consciously pulled back. He set it down carefully on the floor between himself and Naruto, who immediately picked it up again and resumed his examination.
Kenji sat very still and opened the system panel with a thought.
He had two hundred System Points.
He navigated to the shop.
The System Shop was not what he expected.
He had imagined something sparse — a few basic items, weapon upgrades, the kind of early-game inventory that existed to teach mechanics before the real content unlocked. What he found instead was a catalogue so extensive that he spent ten minutes just scrolling through categories.
Weapons. Armor. Medical Supplies. Jutsu Scrolls. Skill Books. Consumables. Equipment. And at the bottom, greyed out and locked behind a level requirement: a category simply labeled APOCALYPSE GEAR with a small icon that looked like a biohazard symbol.
He felt his stomach drop looking at that icon. Then he felt something else — something steadier. It was there. The system knew what was coming. It had prepared for it.
He browsed carefully, cross-referencing prices against his 200 SP.
Most of what he wanted cost more than he had. The Jutsu Scrolls started at 500 SP. Medical items were reasonable but he had no immediate need. Weapons were locked until Level 5.
Then he found the Skill Books section.
Most were locked. But one was available, sitting at exactly 150 SP, as if it had been placed there deliberately:
[ITEM: Chakra Control Fundamentals — Advanced]
A comprehensive guide to chakra regulation, flow management, and precision control. Compatible with Learning Assimilation feature.
Cost: 150 SP
Note: Learning Assimilation converts written content directly to passive skill memory upon contact. Reading time: approximately 3 seconds.
He checked. Learning Assimilation was listed as a base feature of the system, already active.
He bought it.
The book appeared in slot one of his inventory — physical, real, a slim volume with a plain cover. He reached into the air beside him, and his hand closed around it. He pulled it out. Naruto watched this with the intense focus of someone witnessing magic and storing it for future reference.
Kenji opened the cover.
Three seconds later he closed it.
Every concept in the book — flow pathways, pressure regulation, the sixteen foundational exercises for precision control — existed now in his memory as clearly as if he had spent years drilling them. Not just memorized. Understood. His body knew what his mind knew.
He set the book down and ran a test — deliberately, this time, controlled — and pushed a thin current of chakra into his fingertip. It responded exactly as the book had described. Clean. Precise. No overflow.
He ran it again. Same result.
He had 50 SP left. Not enough for anything significant. He made a note to be more strategic going forward — SP was not infinite and the items he would eventually need were expensive. He needed to understand the earning mechanics fully before he spent another point.
He closed the shop and opened the Skill Tree.
It bloomed open like a diagram, branching pathways spreading across his vision. Four main branches: Taijutsu, Ninjutsu, Genjutsu, and one at the bottom with no label — just a question mark inside a black circle, greyed out completely.
He already knew what that one was.
He had time. He chose nothing yet, preferring to study the full tree before committing. Resources spent poorly were resources gone.
He closed the panel.
Naruto had gotten bored of the block and crawled over to sit against Kenji's leg. He patted Kenji's knee twice — a habit he'd developed recently — and then simply stayed there, using his older brother as furniture.
Kenji looked down at him.
Eight months old. Blue eyes. Already more chakra potential in his small body than most jonin would ever develop, sealed alongside the most powerful creature in the world. And completely, entirely unaware of any of it.
Kenji put his hand lightly on top of his brother's head.
"I bought a book today," he said quietly.
Naruto looked up at him.
"First of many," Kenji said. "We're going to need a lot of books."
Naruto made a sound that could generously be interpreted as agreement and went back to examining the floor.
From the kitchen, Kushina's voice: "Kenji! What did I just feel? Was that your chakra? Minato, come here — Minato!"
Kenji picked up the practice block and held it ready.
Time to perform being five years old.
End of Chapter 3