It felt as though she were sinking into the depths of an endless ocean.
Darkness surrounded Bronya.
Her body continued to descend through the cold, silent abyss, powerless to resist the currents dragging her deeper into the Sea of Quanta.
Then—
A faint blue light appeared.
A glowing blue butterfly fluttered down through the darkness.
It gently landed on Bronya's fingertip.
The moment its wings touched her skin, Bronya's fingers twitched.
Her eyes slowly opened.
Through the darkness, she saw someone diving toward her.
A familiar figure.
Seele.
Seele reached out her hand toward Bronya.
Bronya: "Seele?"
Bronya's vision gradually became clearer.
The darkness surrounding her began to fade.
Before her, the Herrscher Core of Reason was no longer surrounded by dark red energy.
Its light had changed.
A clear, brilliant blue radiance now shone from the Core.
At the same moment, the tendrils binding Bronya suddenly trembled.
Then—
BOOM!
A brilliant blue light erupted from Bronya.
Tlaloc's tendrils were violently torn apart by the force of the explosion.
The shattered fragments dissolved into particles and disappeared into the Sea of Quanta.
From within the blue light, a familiar mechanical figure emerged.
Project Bunny.
Its humanoid torso was clad in dark gray, matte white, and navy blue armor. Its most defining feature was its head, which possessed two long, sleek, upward-pointing mechanical antennae resembling rabbit ears.
Instead of human facial features, Project Bunny possessed a dark visor and glowing optical sensors.
Its upper body was bulky and heavily armored, while its lower body was absent entirely. Rather than possessing legs, its body tapered off at the waist and hovered directly behind Bronya.
Beside its torso floated two enormous mechanical arms.
The heavily armored arms moved independently, capable of striking enemies with overwhelming force or transforming into massive shields. Their systems could also deploy heavy artillery, including missile pods and powerful laser cannons.
Project Bunny had evolved.
Bronya's own body began to change as well.
Her Yamabuki Armor was infused with the brilliant energy of the Herrscher Core.
The yellow ribbons in her hair shimmered.
The yellow sections of her one-piece garment gradually shifted into a brilliant blue.
Blue Herrscher energy flowed across her armor and mechanical prosthetic legs, replacing the familiar yellow highlights with a cold, radiant azure glow.
Another blue butterfly descended from above.
It flew directly toward Bronya.
The butterfly passed through her chest.
A moment later, its light condensed.
A brilliant blue crystal formed within Bronya's body.
The Herrscher Core's energy surged through her.
At the same time, five figures appeared beside her.
Kamen Rider Zero-Two.
Kamen Rider Ark-Zero.
Kamen Rider Thouser, wielding the Thousand Jacker.
Kamen Rider Vulcan in his RampageVulcan form.
And Kamen Rider Valkyrie in her Justice Serval form.
The five transparent blue warriors stood beside Bronya and the newly evolved Project Bunny.
Then—
Tlaloc: "…!!"
Tlaloc returned.
The grotesque creature rose from the depths of the Sea of Quanta, roaring furiously as it faced Bronya.
The battlefield erupted into motion.
Everyone split up.
Two mechanical wheels manifested beneath Bronya's feet.
She immediately accelerated forward.
Bronya skated across the surface of the Sea of Quanta at incredible speed.
Tlaloc swung one of its enormous tendrils toward her.
Bronya jumped.
She soared over the tendril before landing directly on its surface.
Using it as a path, Bronya continued skating across the creature's massive appendage.
She accelerated toward its end.
Then jumped again.
Bronya launched herself into the air.
Tlaloc opened its maw.
Pink and white energy gathered within it.
The creature prepared to fire directly at Bronya while she was still airborne.
But before the attack could be released—
SLASH!
Kamen Rider Thouser struck Tlaloc with the Thousand Jacker.
At the same time, Kamen Rider Valkyrie in her Justice Serval form lunged forward and slashed the creature with her claws.
The combined attack knocked Tlaloc's aim away.
The energy beam erupted past Bronya and disappeared into the distance.
Project Bunny appeared behind her.
Project Bunny: "All systems nominal."
Bronya: "Ride on!"
Project Bunny: "Ride on!"
Project Bunny: "Switch engine drive."
Project Bunny immediately transformed.
Its humanoid form disappeared entirely.
In its place was an ultra-sleek, low-profile racing motorcycle.
Its body possessed sharp, angled fairings and a heavily swept-back design.
The iconic rabbit ears from its robotic form had been re-engineered.
They now lay flattened against the motorcycle's chassis, functioning as aerodynamic stabilizer fins and high-speed handlebars.
Bronya landed perfectly on Project Bunny.
Together, they descended toward the battlefield.
The moment they landed—
Tlaloc raised its massive left arm.
The creature prepared to crush them.
But—
BANG!
Tlaloc's arm exploded.
The entire limb was obliterated.
Tlaloc roared in pain.
It turned toward the source of the attack.
Kamen Rider Vulcan stood in the distance.
His ShotRiser was equipped with the Rampage Gatling ProgriseKey.
The weapon remained aimed directly at the space where Tlaloc's left arm had once been.
Bronya accelerated.
Project Bunny launched into the air.
A transparent road suddenly manifested before them.
They raced across the newly created path.
As they traveled through the air, multiple Keys of Reason continuously appeared behind them.
One after another.
Each Key of Reason positioned itself in the air.
Every one of them aimed directly at Tlaloc.
Meanwhile, Kamen Rider Zero-Two and Kamen Rider Ark-Zero moved toward each other.
Their forms began to merge.
Blue light surrounded them.
The two Riders fused.
A new warrior emerged.
Kamen Rider Zero-Three.
Kamen Rider Zero-Three turned toward Bronya.
Kamen Rider Zero-Three: "Learning Complete."
Kamen Rider Zero-Three had copied Bronya's newly awakened power.
Multiple Keys of Reason immediately manifested around him.
One after another, they appeared in the air and aimed at Tlaloc.
Then—
BOOM! BOOM! BOOM!
The Keys of Reason fired simultaneously.
The barrage struck Tlaloc.
Its remaining arm was completely destroyed.
Tlaloc: "…!!"
The creature roared in agony.
Enraged, Tlaloc unleashed countless tendrils toward Bronya.
But they never reached her.
Kamen Rider Thouser.
Kamen Rider Valkyrie.
Kamen Rider Vulcan.
And Kamen Rider Zero-Three.
The four Riders intercepted the tendrils.
Every attack was destroyed before it could reach Bronya or Project Bunny.
Finally, Bronya and Project Bunny created another transparent road.
This one led directly toward Tlaloc.
Bronya leaned forward.
Energy began gathering around her.
Project Bunny's systems accelerated.
Project Bunny: "Shift up. One… two… three."
The engine roared.
Bronya and Project Bunny surged forward.
Project Bunny: "Top gear."
They became a streak of blue light.
Bronya and Project Bunny raced directly toward Tlaloc.
The creature attempted to react.
But it was too late.
BOOOOOOM!
Bronya and Project Bunny blasted through Tlaloc's head.
Bronya then jumped from Project Bunny while still in midair.
Project Bunny transformed back into its robotic form and hovered behind her.
Blue energy surrounded Bronya.
Her transformation finally completed.
Bronya had become the Herrscher of Reason.
Her hair had grown much longer, flowing down her back before converging into three distinctive drills.
A black-and-blue ribbon headpiece decorated her hair, while an orange-gemmed silver crown rested above her head.
She wore a black, white, and blue high-collared dress.
A glowing blue, core-like ornament shone from her chest.
Black detached sleeves extended from her arms, accompanied by blue gloves.
A white-and-blue layered skirt-like armor piece surrounded her waist, while black-and-blue mechanical details covered parts of her body.
White armored heels supported her feet.
Armored thigh-highs covered her legs.
The transformation was complete.
Then with her will all the Key of reason blast what remain of Tlaloc
Then Tlaloc's body shattered turn into a massive explosion.
The monster dissolved into countless fragments of light and disappeared into the Sea of Quanta.
The five warriors looked up at her.
Or rather—
Four.
Kamen Rider Zero-Two and Kamen Rider Ark-Zero had fused into Kamen Rider Zero-Three.
Bronya slowly opened her eyes.
The brilliant blue light surrounding her gradually faded.
Her gaze turned toward the depths of the Sea of Quanta.
Toward the place where Seele was waiting.
Bronya: "Seele…"
Bronya clenched her hand.
Bronya: "The Bronya… is here for you."