The moon was high when Hiruko slipped out of the orphanage. Shadows moved silently across the rooftops of Konoha, but he knew the blind spots of the patrol routes by heart.
In his arms was a leather-wrapped scroll soaked with time and dust, bearing the faded seal of the Kubisaki Clan—a line that had vanished from most records after a political scandal years ago. But buried in the scroll's core was something that had caught Hiruko's sharp eyes:
"Chakra Reflection and Folding Through Organic Hosts."
It was forbidden for a reason. Too unstable, too unknown. But to Hiruko, it was opportunity. It outlined a theoretical technique: injecting foreign chakra into one's own system, forcing cellular adaptation in real time. Dangerous. Mutagenic. Exactly what he needed.
Inside an Abandoned Root Training Compound
Hiruko's underground lab was crude—just stone floors, old ANBU medical equipment, and a handful of stolen chakra batteries. But it was enough.
He tied his long black hair back and sat on a sealing circle he had drawn with his own blood and ink. Behind him, an experimental chakra jar pulsed with violet light—his own attempt to stabilize mutated chakra using lightning and wind elements.
"If I can make my cells fold around external chakra types, I can 'learn' them—like biological software. Not mimicry. Integration."
He inhaled deeply, channeling chakra from the jar into his left arm.
The pain hit instantly.
His arm pulsed like it was boiling inside out—veins swelling, muscles twisting.
"Ngh...! Come on... stabilize, stabilize—"
His left palm suddenly glowed with a strange mix of chakra signatures—wind, lightning, fire—all swirling into a spiral before surging inward.
Forbidden Technique: Chakra Pulse ConvergenceEffect: Temporarily overwrites a part of the user's chakra system to "learn" a foreign elemental structure. Unstable. Causes cellular erosion if used for too long.
The spiral collapsed. His hand returned to normal—except now, Hiruko could feel a third affinity burning in his bones: lightning.
"It worked…" he gasped, smiling for the first time in weeks.
Three Days Later – First Attempt at Summoning
Hiruko had recovered quickly. Too quickly. His biology was already mutating from the convergence technique. Curious to test the next part of his plan, he copied a few summoning formulas from the academy library and modified the seal.
"I don't want a toad or a snake. I don't want to be bound to existing contracts."He dipped his fingers in his blood and drew an array with mathematical precision.
Summoning Jutsu: Experimental Cross-Realm Anchor.
The ground shook.
The air folded in on itself.
For a moment, Hiruko thought he had failed. Then—FWOOOM.
The ground beneath him cracked open, and smoke exploded outward.
A massive yellow chameleon, covered in moss and scars, appeared—its tail whipping like a serpent, eyes swirling with chakra rings.
Hiruko froze.
He knew this creature. He remembered it from the extended Naruto archives—Shiromari, the Chameleon Castle Beast, a living summon that once served Kōza Kubisaki before the clan vanished. Its abilities: transformation, stealth, and space-warping genjutsu. It could become a castle—an organic fortress that folded space inside itself.
"I didn't summon a creature... I summoned a biome."
The chameleon looked at him with intelligent, patient eyes.
"You... are not Koza," it rasped in a deep, echoing voice. "Yet you wear the blood of many paths. Why have you summoned me?"
Hiruko stepped forward, blood still dripping from his fingers, his voice calm.
"I'm not your master. But I could be your successor. I'm building a world where chakra and science become one. I need more than a summon. I need a domain."
The chameleon narrowed its eyes. Then, with a low growl, its body began to stretch outward. The ground quaked, and within seconds, walls began to rise from its skin, stone-like but breathing. A castle tower burst upward in the distance, cloaked in chameleon flesh and mist.
Shiromari had accepted him.
Later That Night
Inside the newly formed Living Fortress, Hiruko sat in a meditation chamber built of pulse-veined stone.
He stared at the palm of his left hand. The convergence mark still flickered under his skin. And now, he had a summon—no, a living laboratory.
With the forbidden technique and a sentient fortress at his side, Hiruko knew one thing for certain:
"I'm going to surpass Orochimaru. Not through power. Through evolution."