The underground laboratory was a testament to obsession; fuinjutsu circles covered the floor in overlapping layers, their surfaces marked with the precise geometry of countless experiments. Hundreds of measuring seals lined the walls, their surfaces glowing faintly with residual chakra. Chakra sensors were positioned at precise intervals, their displays dark but ready. Distance markers were etched into the stone floor, each one representing a different range. Timing arrays were suspended from the ceiling, their crystals calibrated to measure intervals down to the millisecond. Calibration formulas were scrawled across every available surface, their lines intersecting and overlapping in a dance of mathematical precision. Entire bookshelves were filled with notebooks from the previous days, each one documenting a failure, a partial success, or a question that had yet to be answered.
Several days had passed since the successful teleportation, and Renjiro had barely slept. Instead of celebrating, he had transformed one of his underground training rooms into a dedicated Hiraishin research laboratory.
A technique isn't mastered because it works once, he thought, his internal voice carrying the weight of his understanding. It's mastered when every failure has been identified. Success is just the beginning; understanding is the goal.
He wrote at the top of a fresh notebook: Question One: What qualifies as a destination? The question was simple, but its implications were profound. He needed to understand the limits of his technique, to know what could become a destination and what could not. He began with the simplest variable; material compatibility.
He started with the simplest variable. Same formula, different materials. He engraved identical Flying Thunder God formulas onto paper, wood, steel, stone, and glass. Each test changed nothing except the medium. He teleported repeatedly, observing the results with his EMS and recording every detail.
Observations emerged from the data. Every material functioned; none failed. But his chakra sensors revealed different retention rates. Steel stored chakra longest, its crystalline structure holding the energy with remarkable stability. Stone was second, its density preserving the formula's integrity. Wood slowly leaked chakra, its organic structure allowing energy to dissipate over time. Paper deteriorated fastest, the delicate fibers unable to maintain the complex circulation patterns. Glass behaved strangely but remained functional; its surface was smooth, but its molecular structure created unexpected resonance patterns.
He wrote his conclusions in his notebook. The formula stores chakra, he recorded. The medium determines how quickly that storage deteriorates. Steel is ideal for long-term applications; paper is acceptable for temporary use; wood is marginal but functional; glass requires further study.
Now he investigated scale. He redrew progressively smaller formulas, starting with large circles and working down to nearly microscopic sizes. The EMS became invaluable; only it could perceive the microscopic circulation pathways that made the formula function. He worked with the precision of a watchmaker, his brush moving with delicate accuracy.
Eventually, one seal failed. Not because of poor craftsmanship, but because the internal lattice physically could not fit. The microscopic pathways were too compressed, their circulation disrupted by the constraints of space. Space no longer recognised it. He examined the failure with his EMS, tracing the collapsed pathways, and concluded that there was a minimum informational density required. Not minimum ink, but minimum structure.
Space recognises information, not appearance, he wrote. The formula must contain enough information to be recognised as a valid destination. Below a certain threshold, it is invisible to space.
He deliberately damaged functioning seals to study structural integrity. Scratches, burns, cuts, and smears were applied with scientific precision, and he documented each result. Some lines did absolutely nothing; they were cosmetic, decorative, perhaps remnants of an earlier design. Others instantly collapsed the technique, shattering the circulation lattice and rendering the seal inert.
Using his EMS, he began mapping Critical Nodes, Structural Veins, Circulation Junctions, and Anchor Locks. This became the first anatomical diagram of a Hiraishin formula, a detailed map of the technique's internal structure. He labelled each component, noting its function and its relationship to the others.
Like a body, he thought, his internal voice carrying the weight of his understanding. Some wounds are superficial; others strike the heart. The formula is alive, and it can be wounded just like any living thing.
The next question was whether a destination must remain stationary. He tested moving objects; kunai, shuriken, chains, wire, paper bombs. He threw them, launched them, let them swing, and teleported repeatedly. Perfect success. The EMS observed the formula constantly recalculating, adjusting its spatial lock to match the moving anchor.
The destination never mattered, he realised, his internal voice carrying the weight of his breakthrough. The identity did. The seal defines identity; space determines location. The formula is a label, not a coordinate.
He wrote in his notebook: The seal defines identity. Space determines location. The formula is a label, not a coordinate. As long as the label exists, the location can be found.
He reviewed his notes in silence, his gaze moving across the pages of experiments and observations. Then he asked himself a dangerous question. If the formula only establishes identity, then what if identity already exists?
Long pause. His thoughts naturally drifted toward his Mangekyō. The EMS mark was different from ink; it already integrated into a person's chakra network. It already had identity, circulation, and synchronisation. It satisfied nearly everything except the actual transition. His eyes slowly widened as the implications settled into his consciousness.
He refused to test this on random shinobi, nor on unwilling subjects. He considered candidates, weighing the risks and benefits of each. Eventually, one person made perfect sense. Saki. She was nearby, trusted, always available, already interacted with him daily, and unlikely to panic over minor oddities. At least, he hoped so.
He walked to the Jonin Command Office, his steps unhurried, his mind already planning the experiment. Saki was buried beneath paperwork when he entered, her desk covered in scrolls and documents.
"You're late," she said without looking up.
Renjiro calmly checked the clock.
"Only by twelve minutes."
She sighed.
"That's still late."
While taking the paperwork, Renjiro activated his EMS. Quietly, almost invisibly. The Mangekyō mark settled into Saki's chakra network, its integration smooth and seamless. He observed the process through his EMS vision; not flashy, extremely subtle, the mark stabilising and integrating with perfect precision. Renjiro immediately deactivated his EMS.
Saki noticed him staring.
"…Why are you looking at me like that?"
He answered truthfully.
"Research."
She paused, her expression shifting from confusion to concern.
"…That's somehow more concerning."
He returned home and locked the laboratory. He reviewed every notebook, checked every equation again, and summarised his findings. Physical formulas required identity, synchronisation, and circulation. His EMS mark already provided those continuously. Only one question remained: could space recognise chakra itself as the destination?
The experiment was simple in concept but profound in implications. No seals, no kunai, no ink. Just Saki's chakra signature. Through his EMS, he perceived it across the village, not visually, but like a beacon, a point of light in the darkness of his perception. He activated Hiraishin, and space folded.
He disappeared.
Inside the Jonin Command Office, Saki worked quietly, organising paperwork with the efficiency of someone who had done it a thousand times. Silence. Then, suddenly, space silently folded. Renjiro appeared beside her. No warning. She jumped, papers exploding everywhere, her hand instinctively reaching for a kunai before she froze.
It was Renjiro. Standing calmly. Already writing observations.
"…You weren't here," she said, her voice carrying the weight of her confusion.
"No."
"…You just appeared."
"Correct."
"…How?"
Renjiro answered with an absolutely incomprehensible explanation.
"I folded the spatial relationship between two chakra reference points by replacing a physical anchor with a chakra-generated identity matrix."
Long silence. Saki blinked twice.
"…What?"
Without clarifying, Renjiro finished writing and teleported away, leaving only displaced air. Saki simply stood there, processing absolutely nothing.
Back home, Renjiro recorded everything. His research journal was a testament to his methodical approach, each entry building on the last.
Operational Limits:
Physical Flying Thunder God Formula: Permanent until destroyed. Compatible with almost all solid materials. Works on moving objects. Extremely stable. Maximum tested range; throughout the Land of Fire. Ultimate theoretical range; unknown.
EMS Chakra Anchors: Created only through Mangekyō activation. One anchor per individual. Invisible within the chakra network. Functions as a teleport destination. Cannot be transferred. Persists indefinitely unless deliberately removed. Slightly higher chakra cost due to synchronisation with a living chakra network.
Unknown Variables: Maximum simultaneous anchors, dimensional compatibility, interaction with suppressed or unconscious chakra, whether another Mangekyō or Rinnegan user could perceive or interfere with the anchors.
He quietly underlined one final sentence.
The Flying Thunder God no longer requires ink to reach a destination.
Another line.
As long as a chakra identity exists…
Final line.
Space itself can be taught where to open.
He closed the notebook.
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