Kazuki stood amid the crumbled bones of the defeated undead, his fists still crackling with faint traces of dark lightning. The air in the dungeon felt heavy and damp, the eerie silence only broken by the occasional drop of water echoing from the distant walls. He took a deep breath, eyes narrowing as he scanned his surroundings. His cold demeanor never wavered, even as his pulse steadied after the battle. But something told him the real challenge was yet to come.

He pushed deeper into the dungeon, his mask hiding any trace of emotion as he explored the ancient, moss-covered hallways. The further he went, the more peculiar the atmosphere became. It was as if the dungeon itself was alive, its oppressive energy seeping into every corner.

As he turned a corner, a faint glimmer caught his attention. He stopped, eyes locked onto a faint blue light emanating from a nearby crevice. Walking closer, he found a small, bluish gem lying in the dust. The gem pulsated with an odd energy, as if calling out to him.

Kazuki crouched down, staring at the stone for a moment. Without hesitation, he picked it up, the cool surface sending a strange shiver through his hand. "What is this...?" he thought, but he didn’t dwell on it for long. He slid the gem into his bag, the mysterious object hidden from view as he continued his exploration.

The dungeon led him to a large chamber, and as Kazuki entered, his footsteps echoed in the cavernous space. At the far end of the chamber stood a massive structure, its intricate carvings worn by time. In the center of the structure was another large, bluish gem—this one far bigger than the one he’d found earlier.

Kazuki's bag began to tremble. He stopped in his tracks, his eyes shifting to the bag as it rattled violently. Confused, he opened it and saw the blue gem he had just picked up glowing brightly, almost as if it had a life of its own. Before he could react, the gem shot out of his bag and flew toward the larger gem in the structure like a magnet.

WHOOOSH!

The smaller gem collided with the large one, and as soon as they connected, the air in the room changed. A low, ominous rumble echoed through the chamber, the ground beneath Kazuki's feet vibrating with power. He stepped back, his eyes narrowing as he watched the blue energy swirl around the structure.

"The hell..." Kazuki muttered, his voice barely above a whisper.

Suddenly, blue tendrils of energy started to emerge from the massive gem, snaking through the air like ethereal tentacles. They twisted and writhed, growing larger with every passing second until they took physical form—massive, water-like tentacles that seemed to distort the space around them.

One of the tentacles shot toward Kazuki with blinding speed.

SWISH!

Kazuki’s reflexes kicked in, his body moving in sync with the threat. He dodged to the side just as the tentacle crashed into the stone where he stood, the impact sending chunks of rock flying through the air.

The tentacles then slithered along the ground, spreading out in all directions. As they made contact with the stone floor, the dungeon began to shift. The ground beneath Kazuki’s feet transformed, turning from solid rock into what looked like a deep, endless ocean. The water surged upward, quickly enveloping the entire chamber.

Stolen story; please report.

Kazuki felt the cold water rise around him, submerging him completely within moments. His eyes widened beneath the mask, and he quickly realized he had no choice but to fight underwater.

The tentacles thrashed wildly in the dark depths, now fully at home in their natural environment. Kazuki gritted his teeth as he focused, his gaze locking onto the source of the threat. Emerging from the dark waters was the massive form of a kraken, its body grotesquely large, its eyes glowing with an unnatural blue light. The giant blue gem was embedded in its head, pulsing with an eerie glow. And within the gem, Kazuki could just make out the faint shape of a girl, unconscious and suspended inside the crystal.

Kazuki clenched his fists, dark magic and lightning surging through his fists. His muscles tensed as he adopted his boxing stance. He knew the underwater environment would slow his movements, but he couldn’t afford to hesitate. He couldn’t reach the kraken’s head directly—not without getting tangled in its tentacles. So he would have to wait for the right moment, biding his time for the perfect counterattack.

The kraken roared, its tentacles thrashing violently. One of them lashed out, cutting through the water with terrifying speed.

Kazuki’s eyes flickered with cold determination as he dodged, narrowly avoiding the strike. The force of the tentacle sent a shockwave through the water, but Kazuki was already moving. He slipped into the gap between the tentacles, his body flowing through the water like a shadow.

BAM!

His fist connected with one of the kraken’s massive limbs, the impact sending a pulse of dark lightning through the creature's body. The kraken let out a deafening roar, but Kazuki didn’t stop. He moved in close, slipping past the thrashing tentacles and delivering another crushing blow to the creature’s side.

Each punch sent a shockwave through the water, and though the strikes injured his fists, Kazuki’s regenerative abilities quickly healed the damage. He knew he couldn’t afford to hold back—this was an all-or-nothing battle.

The kraken, enraged by the attacks, lunged forward, its massive jaws opening to devour him whole. But Kazuki was already anticipating the move. He shifted his weight, dodging to the side and delivering a powerful punch directly to the kraken’s head.

CRACK!

The force of the blow sent the kraken reeling, and Kazuki’s eyes locked onto the glowing gem in its head. Through the fractured light, he could see her—the girl trapped inside the crystal. Her face was peaceful, eyes closed as if in a deep slumber.

"Who...?" Kazuki whispered, his voice muffled by the water.

The sight of the girl momentarily distracted him, and in that instant, another tentacle shot toward him.

WHAM!

The tentacle struck Kazuki with brutal force, sending him crashing into the stone wall of the dungeon. The impact knocked the air from his lungs, but he recovered quickly, his body healing almost as fast as it was injured. His eyes narrowed as he focused back on the fight.

The kraken roared again, the gem in its head glowing brighter. Kazuki knew he had to act fast—he had to break that gem. But first, he had to deal with the relentless tentacles.

Kazuki took a deep breath, steadying himself in the cold, dark waters. He coated his fists with more dark and lightning magic, the energy pulsating around him like an aura of destruction.

"I don’t have time to play around with you," he muttered, his voice a cold whisper in the depths.

The kraken lunged again, but this time Kazuki was ready. He slipped through the gaps in its strikes, each movement precise, each punch delivered with calculated force. The water slowed his attacks, but Kazuki was relentless, focusing his power into every blow.

And as he closed in on the kraken, his eyes locked onto the gem once more. He could see the girl clearly now—unconscious, but alive.

This fight wasn’t just about survival anymore. Something deeper was at play.