The night was eerily silent as Gon, Killua, Tanjiro, Nezuko, and the Hashira stood on the edge of the northern mountains, their silhouettes barely visible in the dim moonlight. The tension was palpable, thickening the air as they prepared for the assault on Muzan's forces. The moonlight bathed the rugged landscape in silver, but despite the stillness, every demon slayer knew what lay ahead—an army of demons, and, worse, the Upper Moons.
Gon clenched his fists, his knuckles white from the pressure. His heart pounded in his chest, but it wasn't fear that fueled his adrenaline. It was anticipation. He had trained for this, fought for this, and now it was time to face the greatest threat they had ever encountered.
Killua stood next to him, his silver eyes narrowed, his body crackling with electricity from Godspeed. He was more focused than ever, his instincts sharper. He could feel the presence of the demons ahead—dark, twisted, and brimming with malicious intent.
Tanjiro, breathing calmly to steady himself, placed a hand on Nezuko's shoulder. His mind raced with thoughts of the fight ahead, but his heart remained calm. He had faith in his comrades and his sister. Together, they would face this darkness.
"I can feel them," Tanjiro murmured, his voice barely above a whisper. "The demons… they're gathering. There's so many of them."
Gon nodded, his eyes scanning the darkness ahead. "We'll fight them together. All of us."
Beside them, the Hashira stood ready. Rengoku's fiery aura blazed with excitement, his hand resting on the hilt of his Nichirin Blade. Shinobu, ever calm and calculating, stood with her usual serene smile, while Tengen Uzui grinned in anticipation, his dual swords gleaming in the moonlight.
Ubuyashiki had warned them of the danger they were walking into. The Upper Moons were among Muzan's most loyal and deadly servants—each one a powerful demon in their own right. But this was their only chance. If they didn't stop Muzan here, the world would be consumed by his darkness.
"We've trained for this," Rengoku said, his voice strong and filled with confidence. "Tonight, we fight not just for ourselves, but for everyone who has fallen to Muzan's evil. We will strike them down!"
Tanjiro looked around at his comrades, his heart swelling with pride. This was the moment they had been preparing for. He turned to Gon and Killua, his eyes filled with determination. "We have to stick together. The Upper Moons are different from anything we've faced before."
Killua's smirk returned, though there was a hint of seriousness in his eyes. "I'm not worried about them. We'll handle whatever comes our way."
Gon grinned, his usual optimism shining through. "Yeah! We've got this."
But as they moved toward the mountains, the reality of what they were about to face began to set in. The air grew colder, the darkness thicker, and the presence of the demons more palpable. It wasn't just the numbers that frightened them—it was the overwhelming, suffocating aura of the Upper Moons. Even from a distance, their presence was undeniable.
Suddenly, a voice echoed through the night, deep and resonant. It seemed to come from everywhere at once, sending a chill through the group.
"You dare to challenge us? How amusing."
Tanjiro's heart skipped a beat as the voice washed over them. He recognized that voice—it was Nakime.
The ground beneath them trembled, and the shadows seemed to shift unnaturally. From the darkness, Nakime's form emerged, her long, flowing hair cascading down her back, her black eyes gleaming with malice. She stood at the entrance to the mountain pass, her pale skin glowing faintly in the moonlight.
"You've come far," Nakime said, her voice soft but filled with venom. "But you will go no further."
Beside Nakime, two other figures appeared from the shadows. One was a tall, muscular demon with piercing eyes and a wicked smile. His body was covered in scars, and his sharp claws gleamed in the dim light. The other was smaller, more elegant, with sharp features and an air of deadly grace. Both of them radiated a terrifying power—Upper Moons.
Killua's eyes narrowed as he felt the surge of power coming from the demons. "So, that's them, huh? The Upper Moons."
Tanjiro's grip tightened on his sword, his breathing steadying as he prepared himself. "They're strong. We have to be careful."
Nakime smiled, her black eyes locking onto the group with predatory glee. "You will die here, humans. Muzan-sama has ordered it."
Without warning, the demons attacked.
The Battle Begins
Rengoku was the first to react, his fiery energy flaring to life as he surged forward, his Nichirin Blade glowing in the moonlight. "Flame Breathing, First Form: Unknowing Fire!" His blade ignited in flames as he swung toward Nakime, the fire cutting through the darkness like a beacon of light.
But Nakime was faster. She dissolved into the shadows, her form shifting like smoke as she dodged Rengoku's attack with ease. Her laughter echoed through the night. "You'll have to do better than that, Hashira."
Tanjiro, Gon, and Killua spread out, their senses on high alert as they faced the two remaining Upper Moons. The muscular demon charged toward them with terrifying speed, his claws raised to strike.
"Jajanken: Rock!" Gon's fist glowed with nen as he launched himself forward, meeting the demon head-on. His punch collided with the demon's claws, the force of the impact sending shockwaves through the air.
The demon's smile widened as he absorbed the impact, his strength overwhelming. "Not bad, human," he growled, his claws scraping against Gon's fists. "But you're nothing compared to me."
Killua darted forward, his body crackling with electricity. "Don't be so sure about that!" He moved like lightning, his claws aimed for the demon's neck. But the demon was fast, faster than they had anticipated. He twisted his body, dodging Killua's attack and retaliating with a powerful swipe of his claws.
Killua barely managed to dodge, the demon's claws grazing his arm as he zipped out of range. "Damn it, he's strong."
Tanjiro, seeing an opening, lunged forward, his breathing steady and focused. "Water Breathing, Fifth Form: Blessed Rain After the Drought!" His blade sliced through the air, aiming for the demon's exposed back.
But the smaller Upper Moon intercepted him, her blade moving with deadly precision. "You won't touch him," she hissed, her sharp eyes gleaming with malice.
Tanjiro's blade clashed with hers, the force of the impact sending a shockwave through the air. For a moment, they were locked in a deadly dance, their swords flashing in the moonlight.
Nezuko, sensing the danger her brother was in, rushed forward, her claws extended as she attacked the smaller demon. Her eyes blazed with fury, and her demonic strength surged as she slashed at the Upper Moon.
The demon laughed, her movements graceful as she dodged Nezuko's attack. "A demon protecting a human? How pathetic."
But Nezuko didn't back down. Her claws flashed through the air as she launched another attack, her movements fueled by the desire to protect her brother.
Meanwhile, Rengoku continued his battle with Nakime, his flames burning brightly as he pushed her back. But Nakime was slippery, her body shifting between shadows, making her difficult to hit.
"Stay still, coward!" Rengoku roared, his fiery aura blazing around him. "Fight me head-on!"
Nakime's laughter echoed through the darkness. "You cannot kill what you cannot catch, Hashira."
The battle raged on, the demons relentless in their attacks. Gon and Killua fought side by side, their movements synchronized as they faced the larger demon. Gon's punches were powerful, each one sending shockwaves through the air, while Killua's lightning-fast attacks kept the demon on the defensive.
But the Upper Moon's strength was overwhelming, and despite their best efforts, they were barely holding him off.
"This guy's a monster," Killua muttered, his body sparking with electricity as he dodged another swipe of the demon's claws.
"We just have to keep pushing!" Gon shouted, his eyes burning with determination. "We can beat him!"
Tanjiro, fighting alongside Nezuko, was struggling to keep up with the smaller Upper Moon. The demon's movements were too fast, too graceful, and her attacks were precise and deadly.
"Tanjiro!" Nezuko growled, her body surging with demonic power as she lunged at the demon, her claws slashing through the air.
The Upper Moon laughed as she dodged Nezuko's attack, her blade flashing toward Tanjiro once more. "You're weak," she sneered. "You'll never defeat me."
But Tanjiro's eyes burned with determination. He wouldn't give up. Not now. Not when the fate of so many rested on their shoulders.
"Water Breathing, Tenth Form: Constant Flux!" Tanjiro's blade surged with power as he launched his attack, the water flowing around him like a raging river.
The Upper Moon's eyes widened in surprise as Tanjiro's attack broke through her defense, his blade slicing through her shoulder. She let out a hiss of pain, but her smile remained. "You got lucky, boy. But this is far from over."
And as the battle raged on, with no end in sight, the group realized just how difficult the road ahead would be.
They were fighting for their lives—and for the future of the world.