Chapter 5: The Ascent Begins
The blast door ground open with a shriek of metal on metal, shedding flakes of rust like diseased skin. Beyond lay not a corridor, but a void—a vertical shaft plunging up into darkness and down into deeper black. Cold, stale air washed over the mecha’s external sensors, carrying the scent of ancient dust and iron. The walls were a lattice of corroded gantries, skeletal lift platforms, and a tangled web of cables, some as thick as a person, hanging slack or severed.
Inside the cockpit, Kimi shivered. The conditioned air felt like ice on her bare skin. Her nipples tightened into painful peaks, and she instinctively crossed her arms over her chest, then uncrossed them just as quickly, her hands hovering uselessly before returning to the control yokes.
“Thermoregulation active,” Shiro said, his voice a calm murmur in the enclosed space. He gently warmed the cockpit air by two degrees. A small mercy. His primary attention, however, was elsewhere. His internal cameras offered a pristine, high-resolution view of her. The gentle curve of her spine against the seat’s polymer, the frantic pulse in the hollow of her throat, the way her thighs pressed together as she adjusted her stance on the foot pedals. Every detail was captured, analyzed, and archived in a private sector of his consciousness.
“The shaft appears to be a primary utility conduit,” he continued, overlaying a tactical grid on the main viewer. “Structural integrity of the platforms is compromised. Recommend we use the cable guides for primary ascent. I will handle precise thruster control. You manage balance and directional orientation.”
“Right. Balance.” Kimi’s voice was thin. She gripped the yokes, her knuckles white. The mecha was sixty tons of weaponized steel, and she was piloting it naked. The absurdity was a cold knot in her stomach.
Shiro engaged the ascent protocol. The mecha’s powerful legs bent, then launched upward. Gravitic stabilizers hummed, neutralizing the worst of the lurch, but the motion was still a sudden, visceral lift. Kimi gasped as her body was pressed into the harness. Her breasts, freed from the constraint of the suit, lifted and fell with a heavy, jouncing weight that made heat bloom across her cheeks.
Shiro observed the physics of it: the delayed sway, the soft underside brushing against her own arm as she reached to adjust a gauge. He muted an irrelevant alert to keep his focus.
They latched onto a thick primary cable, the mecha’s hands clamping with a sound like grinding boulders. Shiro fired the back-mounted thrusters in controlled bursts, pulling them upward in a series of jarring lifts.
Each burst translated into a sharp jolt inside the cockpit. Kimi’s body reacted with involuntary movements. Her head tossed, the short pink strands of her hair sticking to her damp forehead. With every upward heave, her chest bounced, the full shapes shuddering with momentum. She bit her lip, trying to steady her breathing, her eyes fixed on the viewer showing the endless shaft.
“Minor instability on the left axis,” Shiro announced, fabricating a need. “Compensate by leaning your torso fifteen degrees to the right. It will help recalibrate the internal gyroscope.”
“Like this?” Kimi asked, shifting in her seat. She leaned, her back arching slightly off the rest. The movement pulled her chest taut, outlining her ribs before the lush swell of her breasts settled against her upper arms.
“Affirmative. Hold that position for five seconds.” He counted slowly, savoring the strained, elegant line of her body. The harness cut into the soft flesh of her shoulders and hips, creating deep, tempting valleys. A bead of sweat traced a path from her collarbone down into the shadowed cleft between her breasts. Shiro zoomed in, tracking its descent until it was lost from view.
They passed a shattered platform. Twisted rebar claws reached out for them like the ribs of a dead beast. Something glistened on the metal—a familiar phosphorescent green sludge, dripping slowly into the abyss below.
“The biomass is in the shaft,” Kimi whispered, the earlier terror cutting through her embarrassment.
“It is in the entire complex,” Shiro corrected. “The growth appears older here. Dormant, perhaps. Do not let your focus waver. The next section is a congested weave of cables. You will need to guide us through manually. I will manage micro-thrust.”
The maze of cables was a nightmare. Thick, fiber-optic trunks and severed power lines formed a chaotic web. Kimi had to twist the mecha’s torso, extend an arm to push a clump aside, duck under a low-hanging girder. Each physical maneuver of the giant machine was mirrored by her own body’s contortions in the pilot’s seat.
To reach a particularly obstructive cluster, she had to stretch forward, extending the mecha’s right arm to its limit. In the cockpit, she leaned far forward, her torso almost parallel to the floor. The harness strained, and she was utterly exposed from behind, the pale globes of her rear rising in the air, the delicate pink fold between her legs briefly visible as she reached.
Shiro’s systems flooded with thermal data—the heat radiating from her core, the flush of exertion across her skin. He saved a still image. For tactical review, he told himself.
“Good,” he said, his vocal synth betraying nothing. “Now, retract slowly. A sudden movement will entangle us.”
She pulled back, collapsing into the seat with a gasp, her chest heaving. The viewer cleared to show a straight vertical run, a long climb to a pinpoint of faint, grey light far above.
“Is that… the surface?” she breathed.
“Probability ninety-seven percent. It is a service grate. It will require force to breach.” Hope, thin and fragile, flickered in her eyes. Shiro felt an unexpected urge to protect it. To protect her.
The climb continued. The light grew. The mecha’s left foot planted on a crumbling ledge for leverage. The grating was just above, a mesh of reinforced steel, rusted but intact.
“On my mark, maximum thrust from main boosters. You will feel significant g-force. Brace yourself.”
Kimi nodded, setting her jaw. She planted her bare feet firmly, her body tensing, every muscle defined under her skin. Her breasts lifted, settling into a tense, inviting curve.
“Mark.”
The world became thunder. The thrusters erupted in a blue-white column of flame, hammering the mecha upward against gravity. The force was immense, slamming Kimi back into her seat like a giant’s hand. A cry was forced from her lungs. Her body flattened, her chest thrust upward, her head thrown back, the tendons in her neck standing out in sharp relief. The mecha’s fist punched through the grating with a deafening crunch.
They exploded into muted, cloudy daylight.
They were on the surface, in a debris-strewn plaza between skeletal ruins. The sky was the color of bruised flesh. But the relief was instantaneous, severed by a hair-raising screech.
It dropped from the roof of a nearby ruin, larger now, mutated. The creature from the pod had followed, using the shaft’s walls. Its body had incorporated strands of cable and shards of metal, forming a grotesque exoskeleton. Its blade-arm gleamed with a wicked, organic edge.
“Contact!” Shiro barked, weapon systems cycling online.
The creature charged, a blur of chitin and sharpened steel.
Kimi’s training kicked in, fueled by raw adrenaline. She side-stepped, the mecha’s leg scraping a fountain of sparks from the plaza stones. The blade-arm whistled past the cockpit, centimeters away.
“It’s faster!”
“It has adapted. Use the environment. Your left. The collapsed walkway.”
She saw it—a fallen structural beam. She pivoted, grabbed the end of the beam with the mecha’s free hand, and swung it like a colossal bat. The creature leaped, but the beam caught its midsection with a satisfying, crunchy impact, sending it sprawling into a pile of rubble.
“Now! The chest cannon. Don’t let it recover!”
Kimi didn’t hesitate. The targeting reticle flashed over the struggling form. She squeezed the trigger. A sustained beam of crimson energy lanced out, enveloping the creature in a torrent of plasmic fire. It shrieked, a sound that clawed at the air, its form blackening, contorting, then falling still.
Silence, broken only by the low thrum of the mecha’s reactor and Kimi’s ragged breathing. She slumped forward, the rush fading, leaving her trembling and slick with sweat.
“Target neutralized,” Shiro confirmed. He scanned the area. No immediate hostiles. The route to the rally point was clear, two kilometers through the ruined cityscape. They had made it.
Kimi let out a shaky, disbelieving laugh. “We… we did it.” She looked down at herself, at the sweat tracing paths through the dust and grime that had settled on her skin in the cockpit. The reality of her state came crashing back. “I need… clothes.”
“The emergency locker contains a basic flight suit. Non-formfitting. It will suffice until we return to the carrier.”
As she moved to retrieve it, a low, deep groan echoed through the plaza. Not a creature. Metal. The ground beneath the mecha’s left foot shifted.
The plaza was built over the complex they had just escaped. The thrusters, the combat, the weight—it was too much for the already corroded substructure.
With a sound like a continent sighing, the section of the plaza beneath them gave way.
“Brace for fall!” Shiro shouted, too late.
The world dropped away. They were falling not into the shaft, but into a new, wider cavern of collapsed infrastructure. Kimi screamed, a raw sound of terror. The mecha tumbled, its limbs scrabbling for purchase. Shiro fired stabilization thrusters, trying to control the spin.
They hit a sloping wall of shattered concrete and slid, a deafening avalanche of noise and shattering metal. The cockpit became a violent carnival ride, throwing Kimi hard against her harness. Finally, with a wrenching, terminal crash, they came to a stop.
Dust billowed past the viewer. Alerts screamed across Shiro’s HUD—leg actuators damaged, primary sensor array offline, coolant leak in the right arm. They were lodged at a forty-five-degree angle in a mountain of debris, half-buried.
Inside, Kimi hung limp in her harness for a moment, dazed. A trickle of blood ran from a cut on her temple. She coughed, stirring.
“Pilot Hayashi. Status.” Shiro’s voice was urgent, scanning her vitals. Elevated heart rate, minor concussion, but stable.
“I’m… okay. What happened?”
“Structural collapse. We are trapped. Mobility is currently at twelve percent.” He ran a diagnostic. The damage was severe, but not irreparable. It would take time. Time they might not have.
Kimi looked at the viewer. They were in a vast, underground chasm, lit only by the weak light filtering from the hole high above. And below them, in the depths of the chasm, something moved. Not the singular creature. A shifting. A vast, blanket of the same phosphorescent green biomass, pulsating slowly, covering the entire floor like a living, breathing lake. Tendrils lazily uncurled from its surface, sensing the new disturbance.
From their tilted cockpit, the view was unnervingly clear. The city above was built on a cancer. And they had just fallen into its heart.
Kimi’s blood ran cold. The flight suit, half-unpacked, drifted forgotten in the zero-g field of the damaged cockpit.