The buried airport was a war zone. Rubble scattered across cracked floors, twisted metal hung precariously from the ceiling, and smoke from electrical arcs filled the air. Civilians had been moved to safer corridors, but the Prime 10 Devil remained — massive, crimson-eyed, and bristling with corrupted power. Its shadow tendrils lashed outward, striking at anything in reach.
Yuto gripped his katana, golden light beginning to flare along the blade. Memories of past failures weighed on him, but this time, he had his friends at his side. No more hesitation. No more mistakes.
"Keep moving!" Yuto shouted, activating Sun Power: Radiant Wave, a concentrated surge of sunlight energy that extended along his katana, sending a luminous shockwave toward the Devil's limbs. The creature recoiled, but quickly retaliated, swinging its massive claw.
Sousuke twirled his Thunder Bolt weapon, electricity crackling like a living storm. "Time to end this!" He activated Thunder Power: Thunder God's Wrath (8th Technique). Lightning shot from the weapon in controlled arcs, striking the Devil from multiple angles simultaneously. The force threw the creature off balance, sizzling through shadow tendrils and making the ground quake.
Tatsusuke dashed forward, dual-sided katanas spinning. He switched tactics, first using Fog Power: Phantom Veil, creating dense mist to obscure the heroes' movements and confuse the Devil. Then, striking with Wind Power: Razor Gale, gusts cut through debris and shadow tendrils alike. The separation of powers allowed him to both defend civilians and strike offensively, keeping the enemy off balance.
Akari stepped into the fray with a resolute look. Her spear glowed as she whispered, "It's time… my 11th form." Water twisted around her like a serpent as she activated Water Power: Ocean's Wrath (11th Technique). A massive, spiraling wave surged from her spear, striking the Devil with immense force, lifting debris, and pushing it back while shielding the remaining civilians.
The Devil roared, staggering but not defeated. It unleashed Shadow Barrage, hurling shards of corrupted energy in multiple directions. Sousuke countered with Thunder Power: Lightning Cage, arcs of electricity intercepting the shards mid-air, vaporizing them instantly. Tatsusuke used Fog Power to obscure civilians, while Wind Power propelled him toward openings, slicing tendrils before they could reach his friends. Akari's Ocean's Wrath split into multiple streams, attacking and shielding at once.
Yuto's heart raced. Flashbacks of his sister's final moments surged in his mind — the pain of loss, the anger, the promise to protect. He channeled everything into his next strike: Sun Power: Solar Nova Strike. The katana ignited in a blinding sphere of sunlight energy, slashing through the Devil's chest and searing away its shadow armor. Smoke and sparks erupted, making the entire terminal glow like a sunrise.
Sousuke saw his chance. Spinning the Thunder Bolt weapon, he guided Thunder God's Wrath (8th Technique) toward the Devil's flanks. Lightning chains wrapped around its arms, immobilizing them momentarily. "Now!" he shouted.
Tatsusuke used Wind Power: Razor Gale to slash tendrils away from civilians, then disappeared in Fog Power: Phantom Veil, reappearing behind the Devil for a surprise strike. Akari thrust her spear with Ocean's Wrath, water spiraling around it to hit the Devil's legs, destabilizing its stance.
The Devil's roar was deafening, shadow tendrils thrashing violently. Its dark energy began to coalesce into Shadow Core Explosion, pulsing with destructive intent. Yuto's eyes blazed gold. "We won't let you hurt anyone!" He leapt forward, katana blazing, and unleashed a Solar Nova Strike Combo, cleaving through the Devil's front and striking its shadow heart.
Sousuke's Thunder God's Wrath erupted in synchronized arcs, the lightning chains cutting deeper into the Devil's limbs. Tatsusuke's dual katanas, powered by Wind Power, sliced through reinforced shadow tendrils, while Fog Power protected fleeing civilians from stray attacks. Akari's Ocean's Wrath surged, water currents twisting like serpents, striking the Devil simultaneously on multiple fronts.
For a fleeting moment, everything paused. The Devil staggered, massive shadow limbs twitching. Its crimson eyes glowed with rage. But the coordination of the four heroes, weapons blazing, and elemental powers unleashed was overwhelming. The combination of Sun Power, Thunder Power, Wind, Fog, and Water Power forced the creature to retreat against the far wall of the ruined terminal.
Yuto landed gracefully, katana glowing softly. "It's weakening… but it's not finished. Everyone stay sharp."
Sousuke's Thunder Bolt weapon hummed faintly, residual electricity dancing across its length. "We've pushed it back this far. Let's finish this together!"
Tatsusuke sheathed one katana briefly, then spun both in a defensive stance. Wind Power created slicing gusts while Fog Power swirled around him, confusing any shadow attack that dared approach. Akari's spear glowed, water swirling fiercely. "No one else will be hurt. I swear it."
The Prime 10 Devil, though battered, rose slowly, preparing for its next assault. Shadow tendrils writhed, pulsing with dark energy. The buried airport trembled as if the entire structure recognized the power struggle unfolding within it.
Yuto exhaled, gripping his katana tightly. "This fight… is far from over. But we fight together. That is our strength."
Sousuke's eyes glimmered, arcs of electricity dancing along the Thunder Bolt. "Thunder God's Wrath… and everything we've learned. It ends here."
Tatsusuke's dual katanas flashed, Wind Power slicing tendrils, Fog Power hiding civilians, while Akari's Ocean's Wrath (11th) surged once more. The four heroes advanced in unison, ready for the next decisive strike against the Prime 10 Devil.
The buried airport trembled under the force of their combined powers. The war for the innocents was escalating, and the Prime 10 Devil's final abilities were yet to be revealed. But Yuto, Sousuke, Tatsusuke, and Akari were prepared — their weapons, powers, and unbreakable will forged in countless battles.
The storm of elements, sunlight, lightning, wind, fog, and water raged on.
And the Prime 10 Devil would not stand.