Naruto: Call of Cthulhu

At night, Kagami sneaked out of his house and headed straight for the Uchiha clan's headquarters

Six years ago, after the Nine-Tails incident, Danzo took advantage of the village's reconstruction efforts and proposed to isolate the Uchiha clan in the northwest corner of Konoha. This location was several miles from the village's core, separated by a vast forest, practically making it a separate village.

Normally, this forested buffer zone was patrolled by ANBU sentries, but today, per Danzo's orders, they had all been withdrawn.

As Kagami made his way through the forest, he observed his surroundings via spider vision. No ANBU in sight. No Root. Danzo's chess pieces are all in place.

Wearing a black outfit that wouldn't reveal his identity, he easily infiltrated a small house near the Uchiha compound. This dilapidated cabin, once a forester's dwelling, had long been abandoned and became a meaningless, ordinary wooden house, now called the Uchiha Cabin.

And since no one would come here at night, it was the perfect spot for summoning. He surveyed the run-down structure, a sardonic smile crossing his face.

As he began methodically setting up for the ritual, he retrieved an item from his pocket. A shining irregular octahedron, an old object he had found on the night of Orochimaru's defection.

He believed that it must be a medium for summoning, and he didn't know if the creature inside would attack him; this was why he had never used it. But after his encounter with Atlach-Nacha, he felt some kind of familiarity with this box.

Kagami turned the octahedron over in his hands, lost in thought. Fate works in mysterious ways.

He somehow knew that it was a box that should never be completely closed. If the lid was shut, the outside light would be cut off from the black crystal inside, summoning a Night Spider.

How he knew the name, he didn't care; he just knew it. Call it instinct or fate.

As he prepared for the summoning, memories of his encounter with Atlach-Nacha flooded back. That day changed everything.

The Night Spider fears light intensely. Any unnatural light can dispel it. But aside from this weakness, the Night Spider is nearly invincible.

"A box never to be fully closed, a creature that fears the light. What a paradox."

He held the box, which had 24 irregular surfaces, and with a firm press, he sealed the lid over the black crystal inside. Instantly, he heard a faint monster's howl by his ear, a sound only he could hear.

Black smoke poured from the gap between the lid and the box. The smoke gathered and formed a visible shape resembling a spider. Its legs swirled in shifting patterns of smoke, and atop its head was a single crimson eye, split into three sections.

The Night Spider had been successfully summoned, and the octahedron had fused into its body, only to reappear when the Night Spider was dismissed.

Kagami stared into its fiery, three-part eye, feeling neither fear nor trembling. It seemed he was immune to its terror. Would it have attacked me if I hadn't met the Spider God?

The Night Spider bowed slightly, sensing no other human presence and awaiting his command. Is it bowing to me? Have I truly moved beyond humanity now?

"Don't worry, you'll feast soon enough. The Uchiha clan has nearly a thousand people," Kagami said. A sacrifice for the greater good? I am no such hypocrite. It is simply the strong devouring the weak. Such was the way of their world.

The creature seemed to understand. It emitted soft, growling noises like purrs from its cloud of smoke.

The stage is set. We are kindred spirits in this hopeless world full of cancer cells. Cells that only harm others and the world itself.

And I am just one of them.

A cancer cell.

After sending off the spider, he quickly left the wooden cabin and headed to the power station in the Uchiha compound. The Night Spider fears unnatural light, so he needed to destroy the lighting first. 

Once the entire compound was plunged into darkness, it would be harder for the Uchiha clan members to grasp their surroundings. Due to the compound being far from Konoha, the clan managed all infrastructure themselves. The power station was located at the edge of the compound, and he found it quickly.

Slightly opening the door to the power room, he saw part of a leg lying on the ground at the corner of the control panel. Upon closer inspection, it turned out to be an Uchiha clan member lying in a pool of blood.

It seems the great purge had already begun.

Itachi or Obito? Their handiwork lacks... finesse.

To prevent anyone from escaping, they must have assassinated the Uchiha members on the outer edges first, before moving inward to carry out their massacre.

"Help… help…"

The man barely opened his eyes as Kagami approached. He tried to call for help, but before he could finish speaking, a mouthful of blood gushed out.

He knelt beside the dying man. "Shhh... You won't feel the pain anymore."

Splat

Although this person was not beyond saving, Kagami still drew his kunai and swiftly slit his throat, speeding up his death. After dealing with the dying man, he walked to the control panel and pulled the large red lever down. Instantly, the entire compound was plunged into darkness.

---

Ten minutes earlier, a strange vortex appeared near the Uchiha compund. Next, a man wearing an orange mask and a black kimono emerged from it, standing in the open space in front of the Konoha Military Police Force building. This masked man was Obito. Using the Body Flicker Technique, he swiftly entered the building.

Soon, the shouts of Uchiha clan members could be heard inside.

"Who are you?!"

"Ah!"

"Someone is attacking us! Everyone, to the front hall for support! Ah!"

"Stay on guard! Stay on guard!"

Inside the building, Obito swung his sword left and right, moving as if no one could stop him.

"What's happening? Who's attacking?" one Uchiha ninja cried out in confusion.

"It's just one man! How is this possible?" another shouted in disbelief.

Combining his powerful Body Flicker Technique with his ability to phase through physical attacks, Obito now felt like a max-level player slaughtering beginners in a starting village.

The Police Force usually dealt with civilian disputes and common thieves, so the Uchiha ninja who usually flaunted their authority were not elite warriors. The building was full of only chunin and genin.

The slaughter continued for seven minutes, and the sounds in the building grew fainter, with only the occasional scream breaking the silence.

"I'll fight you to the end!"

Slash

Another ninja was sliced by Obito's sword, blood pouring from the wound. The man gasped his last breaths, clearly not going to survive.

Obito didn't bother to finish him off, as his massacre mission was quite extensive today. He didn't have time to carefully eliminate every single person. He flicked the blood off his sword, splattering it onto the nearby glass. Then, he glanced at the dozen or so bodies scattered in the corridor behind him and turned to head upstairs.

But at that moment, the lights in the corridor suddenly went out. This sudden change gave him a slight unease. He looked out the window and realized that it wasn't just the building that had lost power—the entire Uchiha compound was now engulfed in pitch-black darkness.

"I thought I already killed the people at the power station. Who shut off the power? Was it Itachi?"

"What a pointless action. Now I'll have to chase after all the little rats trying to escape."

He didn't pay too much attention to the blackout, only complaining that it made things slightly more troublesome. When a house suddenly loses power, it's normal for people to step outside to check if the whole neighborhood has lost power too.

If people saw the killings, they would undoubtedly scatter and flee, which would make his task of hunting them down one by one much more difficult.

After spending another two minutes clearing out the last genin, he casually walked out the building's main entrance. His bold actions were not without reason. His goal was to lure out any hidden weaklings who would try to attack him, saving him the trouble of finding them.

Sure enough, as soon as he reached the steps, he was attacked.

Two shuriken flew straight toward his head, but instead of hitting him, they phased through his body and embedded themselves in the pillar behind him.

He slowly turned to look at the attacker, seeing a girl standing in the open space ahead. But what caught his attention were her eyes—she had a pair of three-tomoe Sharingan.

Although the Sharingan is a unique ability of the Uchiha clan, most members are unable to awaken it. Yet this young girl already possessed a fully developed three-tomoe Sharingan at such a young age—she had incredible potential.

"Oh, nice eyes."

He didn't hold back in praising her, admiring the girl's eyes. Such potential, wasted on one so weak.

The girl didn't respond, instead throwing two kunai one after the other toward his head. This time, she was certain her throws were precise, but once again, the kunai passed through his body and struck the pillar behind him.

"How is that possible?"

"Monster!"

The girl looked shocked, quickly realizing that this person was not someone she could defeat. She turned to flee, but a chain flew from behind, wrapping around her body and pulling her to the ground.

Obito held the chain in one hand and slowly drew his sword with the other.

"Your eyes are excellent, but you have no idea how to truly use the power of the Sharingan. All because there is still love in your heart."

"Allow me to cut away that love for you."

Obito slowly raised his sword, aiming it at the girl, whose tear-filled eyes were desperately calling out to her loved ones in her heart.

"Please... don't..."

Something is not right.

Although the streetlights were out because of a blackout, the moonlight should have been enough to illuminate the surroundings. However, the moonlight seemed to fade, and even the areas under its light were much darker.

He raised his sword, but the once-bright blade now appeared dim, as though its light had been swallowed by something. This darkness... it's unnatural.

Looking up, both he and the girl saw two shadowy figures slowly approaching from about ten meters away. With every step they took, the darkness advanced with them, and the area around Obito grew increasingly dark.

What was even more perplexing was that, despite the overwhelming darkness, they could clearly see the figures within it.

One of them was a man dressed in a black suit, holding a strange, heavy book under his arm. His skin, hair, eyes, and even his teeth were as black as ink. This dark figure was like a harbinger of darkness. Wherever he went, there was only eternal night.

"What... what are they?" the girl whispered.