Deep within the galaxy, two colossal dragon-like monsters tore through the darkness of space at terrifying speed.
They were fleeing.
These creatures were Doomsday Beasts—planet-destroying artificial monsters born from the Antimatter Legion. Alongside an entire Legion fleet, they had descended upon countless worlds before, leaving behind only ruin and silence.
Destruction was what they existed for.
And yet now—
They were the ones being hunted.
Not by a powerful faction.
Not by the people of the planet they targeted.
Not by an army.
But by a single individual who had merely crossed paths with them.
If that being could even be called a person.
At first, the Legion had believed the lone figure would be crushed beneath their overwhelming numbers. One warrior against an entire Legion fleet was nothing more than a foolish death sentence.
Or so they thought.
The mysterious figure raised his fist toward the heavens and shouted—
"Descend! God King-Ohger!"
Space trembled.
A massive summoning circle of golden light erupted into existence, and from it descended an enormous humanoid mecha over eighty-three meters tall.
God King-Ohger.
For a brief moment, the Legion forces hesitated in shock.
But only for a moment.
After all, they still possessed an entire army—countless monsters, heavily armed warships, and two Doomsday Beasts.
Against them stood only a single machine.
So they charged forward without fear.
And that was their greatest mistake.
God King-Ohger raised its massive right arm.
Energy condensed within the cannon mounted upon it—
Then fired.
A beam of overwhelming power erupted across space, instantly vaporizing multiple Legion battleships. Entire vessels disappeared in explosions of fire and shattered metal before they could even react.
The mecha then accelerated forward.
Its speed surpassed light itself.
Within seconds, it crashed directly into the Legion formation like a comet.
Warships were torn apart.
Voidrangers were obliterated.
Explosions illuminated the void as the massive machine rampaged through the Legion army with unstoppable force.
The Antimatter Legion fought back desperately, unleashing wave after wave of attacks upon the giant king.
None of it mattered.
Missiles, energy blasts, and claws capable of tearing worlds apart struck God King-Ohger—
Yet the divine mecha remained completely unharmed.
Not even a scratch marked its armor.
Fear spread through the Legion.
And now, all that remained of the once-mighty Legion force were the two fleeing Doomsday Beasts as God King-Ohger continued its relentless pursuit across the stars, the two fleeing Doomsday Beasts desperately trying to escape the mechanical king that had annihilated an entire Legion fleet.
The chase carried them toward a blue-colored planet surrounded by drifting clouds and shimmering oceans.
Orbiting the planet was a massive space station.
The pilot inside God King-Ohger narrowed his eyes slightly as the giant mecha slowed for a moment.
"…A railway platform?"
Even through the chaos, he couldn't help but sound confused.
A literal railway platform extended from part of the station, as if a train could somehow arrive in the middle of space itself.
"…Okay then."
Still, strange architecture was hardly the weirdest thing he had seen.
But something else immediately caught his attention.
Another Doomsday Beast.
This one was attacking the space station directly.
And standing against it were four individuals desperately holding the monster back.
Even from a distance, he could see flashes of combat—arrows of light, spear strikes, and bursts of energy colliding against the gigantic creature as alarms blared across the station.
The pilot watched silently for a brief second before glancing back toward the two Doomsday Beasts he had been chasing.
"…Right."
He pointed forward.
"First, I finish these two."
The eyes of God King-Ohger blazed with light.
Then the colossal mecha accelerated once more, charging after the fleeing monsters at impossible speed while the battle around the space station continued to rage.
On the space station, four individuals stood against the monstrous Doomsday Beast.
A pink-haired girl wielding a bow.
A black-haired young man armed with a spear.
A gray-haired boy gripping a baseball bat.
And a red-haired woman carrying a briefcase that transformed into a multi-purpose weapon.
They were March 7th, Dan Heng, Caelus, and Himeko of the Astral Express.
The massive creature roared as it unleashed waves of destruction across the platform. Explosions shook the station while the group desperately dodged and countered its attacks.
March fired arrow after arrow of ice-charged energy while Dan Heng struck with precise spear thrusts. Himeko supported them from the rear, her weapon shifting forms seamlessly as she launched powerful blasts toward the beast.
Meanwhile, Caelus rushed in headfirst, using his bat to block incoming strikes despite the overwhelming size difference.
The battle was already difficult enough—
Then things got worse.
Far above the battlefield, two more Doomsday Beasts suddenly flew past the station.
Everyone froze for a moment.
March's eyes widened in horror.
March 7th : "What?! Why are there more Doomsday Beasts?!"
Himeko narrowed her eyes, immediately realizing how disastrous the situation had become.
Himeko : "This is bad… We need to—"
Before she could finish—
Something crashed into the two incoming monsters.
The impact shook space itself.
A colossal humanoid mecha slammed directly into the pair of Doomsday Beasts with overwhelming force.
God King-Ohger.
The gigantic mechanical king raised its right arm.
The Kabuto Cannon.
Energy surged into the massive weapon before erupting into a blinding beam of light.
The attack tore through both Doomsday Beasts instantly.
No struggle.
No resistance.
Their gigantic bodies were completely annihilated, reduced to dust and particles drifting through space.
The Astral Express crew stared in shock.
Caelus blinked in disbelief.
Caelus : "…Is that mech on our side?"
God King-Ohger slowly turned toward the remaining Doomsday Beast attacking the station.
The Kabuto Cannon began charging once more—
But this time, only slightly.
Precise.
Controlled.
Just enough power to eliminate the monster without damaging the station itself.
The beam fired.
The Doomsday Beast didn't even have time to react before the attack pierced straight through it.
Its massive body began disintegrating into glowing particles.
But before disappearing completely—
The creature unleashed one final desperate attack.
A beam of destructive energy erupted from its mouth—
Straight toward March.
Himeko and Dan Heng's expressions changed instantly.
"March!!"
But before the attack could reach her—
Caelus jumped in front of her without hesitation.
The beam struck him directly.
The explosion of energy engulfed his body.
Then—
Something changed.
Inside God King-Ohger, the pilot watched carefully.
He had been moments away from using the power of Kamen Rider Geats Mark IX to create a barrier around the group—
But now, something far stranger was happening.
The gray-haired boy was being flooded with power.
A familiar power.
The pilot's eyes narrowed.
It was the energy of Destruction.
A conceptual force he knew all too well, after all, that being had escaped him countless times whenever he tried to finish it.
Energy exploded from Caelus's chest in violent waves.
A shockwave burst outward, completely erasing the remains of the already dying Doomsday Beast from existence.
But the power didn't stop.
The energy surrounding Caelus only continued to grow stronger.
Violent winds erupted around him as pure golden destructive energy engulfed his body and lifted him into the air.
The pilot's expression darkened.
Pilot : "Not good."
Power on this scale was never a good sign.
Then suddenly—
He felt it.
As he was Gazing at the boy, portion of his own energy was being pulled away.
His eyes widened as he stared at Caelus.
And what happened next shocked him completely.
Pilot : "What?!"
The destructive energy surrounding Caelus suddenly stabilized.
Green light erupted around the boy's body.
Armor began forming piece by piece.
The pilot recognized it immediately.
A silver crest with four sharp spikes extended from the helmet. Large yellow compound eyes glowed brightly beneath it, while green armor lined with silver circuitry covered the body. At the center of the chest, a cyan holographic display projected a digital human silhouette.
Ganbarider.
The pilot immediately understood what was happening.
The form was drawing directly from his power.
Caelus slowly descended back toward the platform as the transformation faded away.
The armor dissolved into particles of light.
Then his body went limp.
March quickly caught him before he hit the ground.
Her face was filled with worry.
Then—
A calm male voice spoke from nearby.
??? : "Seems like I was late."
March turned immediately.
Standing there was a man holding a cane.
Welt Yang.
Relief instantly appeared on her face.
March 7th : "Mr. Yang! Is he…"
Welt looked at Caelus before reassuring her calmly.
Welt : "They're okay now. Let's talk somewhere else."
Then suddenly—
A loud voice echoed across the station.
"THERE YOU ARE, WELT!!!!!"
Welt froze.
He recognized that voice instantly.
Slowly, he turned around.
God King-Ohger descended onto the station platform with a heavy metallic impact.
March, Dan Heng, and Himeko immediately moved protectively in front of the unconscious Caelus.
Himeko's expression sharpened, ready to summon her orbital laser cannon at any moment.
But Welt raised a hand to stop them.
Welt : "It's okay, everyone. He's a friend of mine."
The others looked at him in confusion.
March tilted her head.
March : "A friend of Mr. Yang?"
The gigantic mecha began dissolving into streams of energy.
From within it, the pilot slowly floated downward as the scattered energy returned to his body.
He landed gently before the group.
Then he looked up.
The moment Welt saw his face, recognition immediately appeared in his eyes.
A smile slowly formed on Welt's face.
Welt : "Long time no see, Kouga Hayata."