The laboratory emerged from the mountain mist like a wound in the earth.
Seiji observed it from a ridge, his Tenseigan fully active, perceiving the twisted chakra signatures within. Kuroishi had converted an abandoned mine into a fortress of horrors. The main entrance was reinforced with steel and earth-style barriers. Watchtowers ringed the perimeter, manned not by human guards but by chimeras—hulking shapes that moved with wrong, jerking gaits, their chakra signatures a sickening fusion of human and beast.
Byakko crouched beside him, his amber fur bristling, his golden eyes fixed on the facility below. A low growl rumbled in his chest—ancient, predatory, utterly without mercy.
"I smell them," the tiger said, his voice tight with restrained fury. "Tigers. My kin. Broken and twisted into those... things. Kuroishi has stolen from the Tiger Clan. He has defiled our blood."
Seiji perceived what Byakko meant. Three of the chimera guards carried traces of tiger chakra—the distinctive resonance of the ancient summons, corrupted and weaponized. Kuroishi had somehow captured members of the Tiger Clan, or obtained their remains, and fused them with human subjects. The result was abominations: powerful, mindless, utterly loyal to their creator.
"We'll free them," Seiji said. "Death is the only freedom they have left."
"Yes." Byakko's voice was cold. "But Kuroishi dies by my fangs. His defilement of my clan demands it."
"Agreed. But we do this my way. Quiet. Precise. We eliminate the chimeras without raising an alarm. When we reach Kuroishi, you can have your vengeance."
The tiger's golden eyes met his. For a moment, Seiji saw the ancient predator beneath the young exterior—the accumulated fury of generations who had been hunted, captured, defiled by those who sought to steal their power. Then Byakko nodded.
"Your way, summoner. But he dies screaming."
---
The infiltration began at midnight.
Seiji moved through the facility's perimeter like a ghost, his Tenseigan guiding him past the watchtowers' sightlines, through gaps in the patrol patterns. The chimeras were powerful but stupid—their corrupted minds incapable of the disciplined attention of trained shinobi. They followed predictable routes, responded to obvious stimuli, and failed to notice the shadow slipping through their defenses.
Byakko moved beside him, his massive form somehow silent, his golden eyes fixed on their prey. The tiger's fury was contained, channeled into predatory focus. He would not compromise the mission. But when the moment came, he would unleash everything.
The first chimera died without a sound.
It was a twisted fusion of man and bear—hulking, powerful, its fur matted and its eyes empty. Seiji's bone thread found the connection between its corrupted chakra network and its brain stem. A precise severance. The creature crumpled, its golden thread—wrong, flickering, already half-extinguished—finally fading.
One.
Byakko took the second. A tiger-thing, its stripes distorted, its fangs overgrown. The young tiger moved like liquid amber, his jaws closing on the chimera's throat before it could react. A single, savage shake. The creature went limp.
Two.
They moved deeper into the facility.
The mine's tunnels branched in every direction, their walls reinforced with steel beams and flickering electric lights. Kuroishi had modernized his domain, blending ancient stone with industrial efficiency. Laboratories lined the corridors—rooms filled with specimen jars, surgical tables, the detritus of countless failed experiments. The air stank of chemicals and old blood.
Seiji's Tenseigan perceived the prisoners before he saw them.
They were in a holding cell at the tunnel's end—three shinobi, their chakra signatures weak, their golden threads flickering with exhaustion and fear. Konoha forehead protectors. A patrol that had been reported missing three weeks ago. Kuroishi had been using them as test subjects.
Byakko growled low. "We free them."
"Yes. But carefully. They may be compromised—conditioned, or implanted with triggers."
Seiji approached the cell. The three shinobi looked up—two men, one woman, their eyes hollow, their bodies bearing the scars of Kuroishi's experiments. They flinched at his approach, expecting more pain.
"I'm Konoha ANBU," Seiji said, his voice flat. "I'm here to eliminate Kuroishi and destroy this facility. Can you walk?"
The woman—a chunin with short brown hair—nodded slowly. "Yes. He... he hadn't started today's session yet. We can move."
"Good. Follow the eastern tunnel. It leads to a secondary exit. My summon will guide you." He gestured to Byakko. "He'll protect you until you're clear. Then he'll return to me."
Byakko's golden eyes widened. "Summoner—"
"Kuroishi is mine. You said it yourself—the defilement of your clan demands vengeance. But these prisoners need protection. You can provide it." Seiji met his gaze. "Trust me to handle the scientist. I'll leave him breathing for you."
The tiger was silent for a long moment. Then he nodded. "Do not kill him, summoner. That pleasure is mine."
"Agreed."
Byakko led the prisoners toward the exit, his massive form a shield between them and the horrors of the facility. Seiji turned and walked deeper into the laboratory.
---
The central chamber was vast, its ceiling lost in darkness.
Kuroishi waited at its center.
The scientist was a small man, bald, with thick spectacles and cold, curious eyes. He wore a stained lab coat over simple clothes, and his hands were never still—constantly adjusting instruments, checking readings, recording observations. His chakra was civilian-weak, utterly unremarkable. But his mind—Seiji could perceive it through his Tenseigan, a labyrinth of cold curiosity and absolute amorality. Kuroishi didn't hate his victims. He simply didn't see them as people. They were resources. Specimens. Data points.
"The half-breed," Kuroishi said, his voice clinical. "The White Bone Baku. I wondered when Konoha would send someone." He adjusted his spectacles. "Your Tenseigan is remarkable. A fusion of Hyuga and Kaguya bloodlines, producing a dojutsu unseen since the age of myths. I've studied the reports extensively. Your perception capabilities, your bone manipulation, your ability to sever conceptual bonds—all unprecedented."
"You've studied me. And yet you didn't flee."
"Flee? Why would I flee?" Kuroishi's cold eyes gleamed. "You are the perfect specimen. The culmination of everything I've worked toward. A bloodline that shouldn't exist, wielding power that transcends ordinary shinobi. If I can understand you—replicate what you are—I can create weapons that will make Kumo's chakra cannon look like a child's toy."
Seiji's bone armor formed. "You won't leave this facility alive."
"Perhaps. Perhaps not. But I will learn from you, half-breed. One way or another." Kuroishi raised his hand. "Come, my children. The specimen has arrived."
The chamber's shadows moved.
Chimeras emerged from hidden alcoves—dozens of them, their forms twisted and wrong. Tigers and bears and wolves, fused with human subjects, their eyes empty, their movements coordinated. Kuroishi had been breeding them, refining them, creating an army of biological weapons.
And at their center, three creatures that made Seiji's blood run cold.
They were almost human. Almost. Their bodies were shinobi-shaped, but their skin was pale, translucent, revealing the corrupted chakra networks beneath. Their eyes were empty, but their movements were intelligent, coordinated. Kuroishi had been fusing his test subjects with something else—something ancient. Otsutsuki fragments. The same resonance Seiji had felt in the desert shrine, in the samurai fortress.
"You used Otsutsuki remains," Seiji said. "You fused them with living subjects."
"Yes! The fragments contain immense power, but they're dormant. I found a way to awaken them—to bind them to human vessels." Kuroishi's voice was reverent. "These three are my greatest creations. They carry the blood of gods, half-breed. They will tear you apart, and from your remains, I will unlock the secrets of the Tenseigan."
The three Otsutsuki-chimeras attacked.
---
They were fast—faster than any chimera had a right to be. Their movements were coordinated, intelligent, their empty eyes tracking Seiji's every motion. One came from the left, its arm transforming into a blade of bone—Kaguya blood, awakened and weaponized. One came from the right, its eyes blazing with Byakugan-like perception—Hyuga blood, corrupted but functional. The third came from above, its body flickering with something like space-time manipulation—a fragment of Otsutsuki power, incompletely manifested but still dangerous.
Seiji moved.
His Wind-enhanced speed carried him past the first chimera's bone blade. His Gravitic Pulse disrupted the second's Byakugan perception, throwing off its aim. His bone armor caught the third's spatial strike—a glancing blow that tore through his shoulder plate but didn't reach flesh.
They were powerful. Coordinated. Designed to counter his abilities.
But they were not him.
"Bone Garden Jutsu."
The chamber floor erupted. Fossilized remains, buried for millennia, awakened at his command. Spikes of white burst from the stone, separating the chimeras, forcing them apart. They adapted—the Kaguya-chimera shattered the bones with its own spikes, the Hyuga-chimera perceived the attack before it fully formed and dodged, the Otsutsuki-chimera flickered through space to avoid the trap entirely.
Seiji had expected that.
He was already moving, his true target not the chimeras but their creator. Kuroishi stood at the chamber's center, his cold eyes wide with fascination, recording every moment of the battle. He didn't fear death. He only feared failing to learn.
Seiji's bone spike extended toward the scientist's heart.
The Otsutsuki-chimera intercepted, its spatial flicker bringing it directly into the spike's path. The bone pierced its chest—but the creature didn't die. Its corrupted chakra network simply reformed around the wound, Otsutsuki regeneration working even in this twisted vessel.
"Remarkable, isn't it?" Kuroishi's voice was reverent. "The fragments grant immortality of a kind. My children cannot be killed by conventional means. They simply... persist."
Seiji calculated. The chimeras' regeneration was powerful but not unlimited. Each wound drained their corrupted chakra. If he could damage them faster than they could heal, they would eventually fall.
But he didn't have time for a war of attrition. Byakko would return soon. The prisoners needed to reach safety. The facility needed to be destroyed.
"Severing Threads of Existence."
He didn't aim for the chimeras' lives. He didn't aim for their corrupted chakra networks. He aimed for the threads that bound the Otsutsuki fragments to their human vessels—the ancient power that Kuroishi had awakened and enslaved. Complex threads, reinforced by the scientist's will and the fragments' own dormant hunger.
He pressed.
The Kaguya-chimera screamed—a human sound, buried beneath layers of corruption. The thread connecting it to its Otsutsuki fragment snapped. The creature collapsed, its bone blade crumbling, its empty eyes finally showing something like relief before they went dark.
One.
The Hyuga-chimera perceived what he was doing. It tried to flee, its Byakugan showing it the threads he was severing. But perception without understanding was useless. Seiji's second severance found its fragment's binding. The creature crumpled, its eyes fading.
Two.
The Otsutsuki-chimera was the strongest. Its fragment was larger, more complete, its regeneration faster. It flickered through space, trying to escape Seiji's reach. But the Severing Threads technique didn't require physical proximity. It required perception. And Seiji could perceive the thread that bound the fragment to its vessel, no matter where the creature fled.
He pressed.
The thread snapped. The Otsutsuki-chimera materialized mid-flicker, its spatial technique collapsing. It fell to the chamber floor, its empty eyes fixed on nothing. The fragment within it went dormant, its hunger temporarily sated by the creature's death.
Three.
Kuroishi stared at his fallen creations. His cold eyes were wide—not with fear, but with fascination. "Incredible. You severed the bindings. I didn't know that was possible. The Tenseigan truly is—"
Seiji's bone spike pierced his shoulder, pinning him to the wall.
"You wanted to learn," Seiji said, his voice flat. "Learn this. Your creations are dead. Your research will be destroyed. You will face justice for what you've done."
"Justice?" Kuroishi laughed, blood bubbling at his lips. "There is no justice. Only knowledge. Only power. I pursued both. I have no regrets."
"You will."
Byakko emerged from the shadows, his golden eyes blazing with ancient fury. The prisoners were safe. Now came the vengeance.
"Summoner. You left him breathing."
"I promised you that pleasure."
The tiger padded forward, his massive form dwarfing the pinned scientist. Kuroishi's cold eyes finally showed fear—not of death, but of the predator whose kin he had defiled.
"Wait," Kuroishi gasped. "I have information. About the fragments. About where they come from. About what's coming—"
Byakko's jaws closed on his throat.
The scientist's words died in a gurgle. His golden thread—weak, flickering, utterly unremarkable—faded into nothing. The Tiger Clan's vengeance was complete.
Seiji watched without expression. Another face for the memory. Another threat eliminated. Kuroishi had information, yes. But he had also defiled Byakko's kin. Some debts could only be paid in blood.
"Are you satisfied?" Seiji asked.
Byakko released the body, his muzzle stained red. "Yes. The defilement is avenged. My kin can rest." His golden eyes met Seiji's. "Thank you, summoner. For leaving him to me."
"You earned it."
They stood together in the chamber of horrors, surrounded by the dead and the dying. The Otsutsuki fragments had gone dormant, their hunger sated by the destruction of their vessels. Kuroishi's research would burn. His specimens would be freed or euthanized. His legacy would be ash.
But Seiji couldn't shake the feeling that Kuroishi's final words had been important. About what's coming. The fragments were scattered across the world, waiting to be awakened. Someone—something—was gathering them. The scientist had known more than he'd revealed.
It didn't matter. The mission was complete. His people were safer.
That was enough.