Godai Yusuke was gone. In his place stood the true Kamen Rider Kuuga.
Kuuga originally possessed five core forms: Growing, Mighty, Dragon, Pegasus, and Titan.
But after enduring countless brutal battles and grueling training, Yusuke had fully mastered that power. The breakthrough triggered a profound physical evolution.
He could now wield the ancient, golden power of the Rising forms. The ancient symbol for 'strength' burned brightly, permanently engraved on the back of his armored hands.
Initially, he could only sustain this volatile Rising state for a fleeting thirty seconds before reverting. Taking too much damage would violently force his body all the way back to the fragile Growing form.
But Yusuke had shattered those limits. His external power had finally fused seamlessly with his iron-clad internal will.
This fusion unlocked his absolute biological combat weapon: Ultimate Form. Only a warrior with a truly unbreakable spirit could suppress the primal bloodlust it induced.
Covered in jagged black armor pulsing with golden veins, Kuuga retained his sanity, his visual sensors glowing a fierce, heroic red. If he ever yielded to the darkness, those eyes would pitch to a dead, soulless black. It was the absolute pinnacle of balanced strength.
Yet, Yusuke pushed even further. He executed a Super Transformation, ascending into the Super Rising Ultimate Form.
It was Kuuga's most perfectly balanced state, equipped with heavy golden anklets specifically designed to amplify his devastating kicks. The world had once feared this god-like entity as 'Unidentified Lifeform No. 4.'
It was a terrifyingly volatile state. Only a truly pure heart could tame its absolute destructive power.
Its signature finishing move, the 'Rising Ultimate Mighty Kick,' was an unstoppable force of nature in melee combat.
Until now, the Super Rising Ultimate Form had never been unleashed on this battlefield.
A blinding golden light, burning far brighter than the desert sun, suddenly erupted atop the fortress walls. The radiance was so agonizingly intense that even the other Kamen Riders had to shield their visors.
Down below, Setsuna was piloting his Gundam out of the fortress hangar when his panoramic monitors violently whited out in a sea of gold.
'Holy crap!' Setsuna cursed. He gritted his teeth, his hands white-knuckling the yokes as he wrenched the controls to keep his colossal mech from crashing into the reinforced trench.
"Adjusting optics to anti-glare mode," Setsuna barked into his comms.
"Deflecting right leg vector thrust by thirty degrees. Correcting dive pitch by five degrees. Ready for takeoff."
His mind processed the complex adjustments in a fraction of a second. The biological neural bundles linking his brain directly to the Gundam's chassis fired at the speed of light.
The massive Gundam smoothly glided out of the reinforced gates. It executed a flawless, drifting slide across the tarmac before rocketing into the sky like a mechanical eagle spreading its metallic wings.
The maneuver was elegant and perfectly fluid. This wasn't just a testament to Sunagakure Heavy Industries' cutting-edge technology.
It was a showcase of Setsuna's unparalleled spatial awareness and raw, unadulterated piloting skill.
Sunagakure engineers had successfully integrated biomechanical technology into the mechs, syncing the pilot's nervous system directly with the machine. A higher synchronization rate meant absolute, seamless control.
Out of hundreds of grueling test subjects, Setsuna was the only one to hit a flawless one-hundred-percent sync rate. That perfect score easily secured his spot as the 5th Division's premier Gundam pilot.
Setsuna blasted through the sky, his targeting reticule zeroing in on Otsutsuki Urashiki. As the mech soared over the fortress, a heavy, dust-filled gust of wind finally cleared the golden glare.
Standing over two meters tall in his towering golden armor, Yusuke looked up and shot the Gundam his signature thumbs-up. Inside his cockpit, Setsuna grinned wildly and returned the gesture.
Whoosh.
The thrusters roared with deafening, earth-shaking force. The Gundam carved a beautiful, deadly arc through the clouds, diving straight at the alien god.
The dual 60mm Vulcan cannons mounted on the mech's head spun to life. They spat a relentless, deafening barrage of heavy tungsten shells.
Boom! Boom! Boom!
Urashiki had also been momentarily blinded by Yusuke's golden flash. By the time his pale Byakugan readjusted, the massive Gundam was already bearing down on him.
The barrage was nearly point-blank, the velocity of the artillery shells terrifyingly fast.
"Amenosubaruboshinomikoto," Urashiki chanted, his tone chillingly calm.
His glowing red fishing rod flared with ominous energy. It instantly generated a massive, translucent sphere of red chakra that perfectly encased his floating body.
The heavy Vulcan shells violently slammed into the protective sphere. They detonated on impact, engulfing the Otsutsuki in a thick, billowing cloud of black smoke and fire.
But the explosion was nothing more than a smokescreen. As the high-altitude winds ripped the smog away, Urashiki floated completely unscathed within his glowing red barrier.
Inside the cockpit, Setsuna tracked the lack of damage via his thermal and infrared imaging monitors. His pulse remained steady.
Everyone knew this alien god wouldn't go down that easily.
'Just as I thought,' Setsuna noted coldly, his grip tightening on the controls. 'Keep the pressure on.'
He shoved the throttle forward. Blue ions violently ejected from the plasma thrusters on the mech's back, generating a massive surge of thrust.
The twin plasma streams flickered behind the Gundam like brilliant, ethereal wings.
Whoosh.
Setsuna aggressively pulled the flight stick up. He climbed higher into the thin atmosphere to maintain a safe, tactical distance.
Reaching the optimal firing altitude, his gloved hands flew across the glowing targeting console. "Plasma beam cannon online!"
He unholstered the Gundam's heavy, anti-battleship plasma rifle. With a sharp mechanical hum, he locked the digital crosshairs squarely onto the floating Otsutsuki.
This wasn't standard artillery. The particle cannon fired a focused, hyper-accelerated stream of magnetically contained plasma.
It was a weapon capable of melting straight through reinforced battleship plating.
The Gundam's internal nuclear fusion reactor surged. It funneled massive amounts of raw, pulsating energy directly into the rifle's core.
A blinding blue-white light began to gather at the weapon's heavy muzzle.
The gathered plasma grew brighter and brighter, the air around it shimmering from the intense heat. It glowed ominously, hanging in the sky like a miniature blue-white moon.
Floating below, Urashiki's pale eyes narrowed as his survival instincts suddenly flared. He tensed, preparing to evade the incoming blast.
But before the Otsutsuki could even twitch, a blinding streak of golden light violently rushed him.
Otsutsuki Urashiki hadn't expected Kuuga to close the distance so quickly.
Caught completely off guard, the alien took a devastating blow directly to the chest. Even with the formidable physical resilience of the Otsutsuki clan, absorbing a one-hundred-and-twenty-ton punch point-blank was unbearable.
He doubled over, violently gagging. Urashiki's pale eyes bulged from their sockets as his stomach spasmed, threatening to expel its contents.
'Is he really this weak?' Yusuke wondered.
But the Kamen Rider had underestimated his foe. Urashiki's glare sharpened, the veins around his eyes bulging as searing abdominal pain fueled his absolute fury.
A violently oppressive aura erupted from the alien's body. "Shinra Tensei!"
An invisible wall of repulsive force slammed into Kuuga, launching him backward like a ragdoll.
'Damn it, I didn't expect that,' Yusuke cursed, realizing that even anticipating the move wouldn't have made it blockable. His golden armor carved a glowing trail through the air as he tumbled backward.
Urashiki wiped the corner of his mouth, his pale fingers coming away stained with fresh blood. His rage boiled over. "How dare you lowly scum hurt me!"
Vvvvvmm.
Setsuna's attack arrived with a deafening screech. The Gundam's particle cannon unleashed a hyper-accelerated stream of plasma.
In the blink of an eye, the blistering blue-white beam descended right above Urashiki's head, blindingly bright.
The Otsutsuki's instincts screamed danger. His glowing red chakra sphere immediately materialized, shifting defensively as he prepared to retreat from the blast zone.
But the plasma stream was far too fast.
The beam violently collided with the crimson barrier, taking Urashiki by complete surprise as the intense heat melted straight through his protective shield. The searing particle beam grazed his shoulder.
'Hell yeah!' Setsuna cheered from high inside the cockpit, watching the plasma land its mark. 'Taking a direct hit from that cannon... I don't care how tough this guy is, he isn't walking that off.'
Yet, the pilot had underestimated the true resilience of an Otsutsuki. The exact moment the plasma scorched him, Urashiki felt the cold breath of death and instantly activated his trump card.
His pale Byakugan shifted, morphing rapidly into glowing blue Rinnegan.
The power of the blue Rinnegan flared. Just as the beam threatened to annihilate him, his body scattered into a flock of glowing red origami paper cranes, vanishing from sight.
It was a space-time technique that allowed him to instantly reappear wherever he pleased.
Setsuna and Yusuke watched as the destructive plasma beam struck empty air. The flock of crimson cranes effortlessly bypassed the blistering attack, scattering into the wind.
"You've gotta be kidding me," Setsuna cursed aloud.
Below, Yusuke tracked the crimson cranes with his red visual sensors as they rapidly dispersed in every direction. Sensing the danger converging on the Gundam high above, he immediately engaged his thrusters.
"Look out behind you!" Yusuke shouted over the comms, rocketing into the sky to intercept.
The paper cranes materialized directly behind the colossal mech, rapidly reforming into Urashiki's body.
The alien god's mouth curled into a ferocious, twisted sneer. "You dare ambush me? I'll tear you into scrap metal."
Channeling the Heretical Path of Yin-Yang Release, Urashiki molded black chakra receivers. His hand blurred as the dense black rods merged and elongated, forming a massive, jagged broadsword.
Diving toward the Gundam's exposed back, he swung the blade with lethal force.
Vvrrrrm!
The Gundam's shoulder-mounted beam shield generators instantly sparked to life. The massive mech spun with surprising grace, catching Urashiki's crushing strike squarely on a blazing energy shield.
Urashiki blinked, genuine shock crossing his pale features. 'How can such a colossal iron beast move with that much agility?'
Setsuna smirked from the cockpit. "That's the beauty of superior firepower, buddy."
With a sharp metallic clang, the Gundam drew two immense beam sabers, igniting them with a blinding flash.
"Die!" Setsuna roared, driving the yokes forward. The colossal mech slashed in a brutal cross-cleave, aiming to bisect the alien god.
The superheated blades spanned a massive radius, leaving the Otsutsuki with seemingly no avenue of escape. But suddenly, a rift of pitch-black shadow tore open directly behind Urashiki.
Yomotsu Hirasaka.
It was the ultimate space-time ninjutsu, a Kekkei Mōra technique that allowed its caster to rip open portals through thin air and effortlessly slip between dimensions.
Urashiki seamlessly glided backward into the dark void. The twin beam sabers sliced violently through empty air, harmlessly crossing over the dissipating portal.
Setsuna frowned at his monitors. "Damn it, a clean miss."
A split second later, the same dark portal tore open just outside the Gundam's melee range. Urashiki stepped out, his face contorted in pure, unadulterated rage, ready to unleash a devastating counterattack.
But a deafening sonic boom shattered the air directly behind him.
"Rising Ultimate Kick!" Kuuga roared.
Having successfully closed the distance, the Kamen Rider drove his devastating signature strike squarely into the middle of Urashiki's back.
Kuuga's golden armor blazed like a falling star, his foot striking with the absolute density of a diamond. The sheer kinetic force behind the blow was apocalyptic, carrying the unstoppable momentum of a meteorite.
Urashiki took the apocalyptic hit before his brain could even process the movement. The impact violently ruptured his internal organs, pulverizing his heart and lungs under a shockwave of golden energy.
Projecting a thick spray of blood from his mouth, the alien was launched violently forward into the Gundam's immediate airspace.
'Perfect opening!' Setsuna realized. Seizing the moment, he raised his beam saber and swung down with zero hesitation.
The massive, superheated blade sheared cleanly through Urashiki's waist in a single, brutal arc.
The immense thermal energy of the beam cauterized the flesh instantly, leaving a glowing, charred wound as the Otsutsuki's severed halves tumbled through the sky.
'We got him!' Setsuna and Yusuke both thought, a surge of adrenaline and victory rushing through them.
But the alien was not completely dead yet.
Within Urashiki's severed head, the concentric ripples of his blue Rinnegan began to spin frantically, generating a volatile temporal vortex.
Time Reversal.
It was the ultimate, reality-bending ability of his blue Rinnegan—allowing him to rewind his personal timeline and retreat several seconds into the past to evade fatal damage.
Reality violently hitched. Suddenly, Kuuga was back in the air.
"Rising Ultimate Kick!" Kuuga roared again, executing the exact same maneuver.
But this time, Urashiki was completely prepared. Retaining the agonizing memories of his own gruesome death, the alien sharply ascended without pausing, causing Kuuga's devastating kick to sail harmlessly right below his feet.