Kazuki hated silence now. Not because it was empty, but because it wasn't. Every quiet moment carried echoes from other cycles—half‑memories, muffled screams, fragments of conversations that never happened in this version of reality. The deeper they climbed, the louder they became. Each heartbeat sent shivers rolling through the thin veneer of sanity he'd painstakingly stitched together. He stared at the floor numbers as the elevator dropped, his breath shallow, the others' exhaustion a smeared blur around him.
Ayato stood near the back wall, eyes closed in concentration, expression taut and pale, as if he could almost feel the Tower's pulse beating through the cables around them. Mio's Archivist Eye glowed faintly beneath her bangs, gold like a smoldering ember, while the others leaned against the walls, mouths pressed thin, fists clenched. The elevator rattled, then stopped with a violent, metallic jolt, the trembling sliding through their bones like a leftover aftershock.
A system notification shimmered above them, letters sharp and cold:
[Floor 36: The Memory Vault]
"Some sins are buried because memory itself rejects them."
– Access Requirement: Cycle Echo Trait
– Only the designated bearer may enter the Vault
– Warning: Recover Warranty—Recovered memories cannot be resealed
"Truth is irreversible."
The doors slid open.
Only Kazuki saw the hallway beyond. For everyone else, the frame shimmered with static, blocking the view.
"What do you see?" Ayato asked, brow furrowing, stepping forward instinctively.
Kazuki swallowed hard, throat tight. "A corridor," he answered, voice low. "Just a corridor. Endless, lit by… something I can't name."
Mio's eyes narrowed, the gold of her True Eye sharpening. "A personal vault," she murmured, soft but certain. "Only one can walk it."
Ayato tried to step forward. "Then we go together."
"No," the system cut in, voice cold and absolute. "Unauthorized entry will result in cognitive collapse."
The elevator lights dimmed to red, the smell of ozone tightening the air. Kazuki felt his heart jump, a rabbit cornered. 'Of course it's alone again. Always alone. So why does that still hurt?'
The Vault's corridor stretched ahead, vast and frigid, lined with enormous iron doors, each engraved with symbols—burning eyes, shattered clocks, nooses of twisted thread. Every door, too, bore his name, hammered into the metal in the script of the Tower's own cruel calligraphy. The deeper he walked, the colder the air became, the silence pressing in like a physical weight. Then the whispers started, voices layered like radio static.
"Coward."
"You always let Ayato choose."
"You wanted him to fail."
Kazuki clenched his jaw. "Shut up," he hissed, fists shaking at his sides.
The corridor answered with a chorus of laughter, a ripple of fragmented echoes that tasted like static ice.
The third door creaked open on its own, a crack offering a dark, perfect memory chamber. Inside, the scene unfolded as if preserved in liquid glass—Cycle 2, Floor 8, rain pouring through broken cathedral windows, the thunder rolling like a dying heartbeat. Young Kazuki, face drawn but stubborn, sat beside Mio, both injured, both exhausted. Mio whispered, her voice a crackle of pain and fear:
"Do you trust Ayato?"
Kazuki remembered answering the question even before he'd lived it. "I trust him to sacrifice us if he thinks it'll save the future."
The memory cut through him now, fresh and jagged, the words hitting like a blade stabbing into his chest. 'I said that. I meant it. And worse…' He remembered the thought that came after, the secret even he hadn't dared to admit until this moment: 'I wanted him to choose me anyway. I wanted to be the one he'd keep, even if it destroyed him.'
The system chimed softly.
[Hidden Envy Detected.]
[Emotional Dishonesty Removed.]
Pain blasted through his skull, the echo of all his buried jealousy, all his jealousy‑masked‑as‑love, ripping through him like a boiler breaking under pressure. He staggered out of the memory, collapsing to his knees, the truth of his own heart laid bare, no room for pretense, no room for anything but the raw, ugly fact of it: he had wanted to be the one worth saving more than anyone else.
He walked on, each step heavier, the corridor closing in around him, the air pressing like a storm ready to break. The final door loomed ahead—taller, blacker, more ominous. It bore no handle, only words carved into steel, words that seemed to pulse with a dark, almost organic hunger:
"OPEN IF YOU WISH TO REMEMBER WHY AYATO FEARS YOU."
Kazuki's hands trembled. The door opened inward, the darkness spilling out like a wound. Then came fire, the heat unbearably real, the smell of burning stone and flesh, the screams of classmates swallowed by the collapse of the Tower around them. The scene unfolded—Cycle 1, Floor 15, the original class dying, the architecture buckling, the world falling apart around them.
Yui lay unconscious, pale and fragile, as Mio bled out on the floor, Ayato shouting at a screen, trying desperately to override the system, sweat and fear carving trenches in his face.
And Kazuki stood before the emergency reset terminal, a single line of text hovering above the keyboard like a digital noose:
SELECT SACRIFICIAL ANCHOR
One person had to remain behind for the Tower to reset. One person had to be left behind in the chaos, sacrificed to give the others a chance to survive.
Ayato screamed at him: "Kazuki, don't—!"
But Kazuki already knew. The choice had already been made in his mind, a decision so quiet, so certain, it had been buried even before the memory formed. The truth unfolded like a blade driven slowly into his chest:
He chose Yui.
Not Ayato. Not himself.
Yui.
Because deep down, he believed: Ayato would never move forward if Yui survived. He believed breaking Ayato's heart might be the only way to forge strength in him. He believed love was a weakness that needed to be scorched out of him, and he'd let the pain of Yui's death do the work that he never could.
Kazuki collapsed onto his knees, the full weight of what he'd done slamming down onto him like a collapsing building. "No," he whispered, tears blurring his vision, the image of Yui waking just enough to see the screen, to see his name, to see the Tower's cold approval flashing across the command confirmation. She looked at him, not with hatred, but with something infinitely worse—understanding.
"You thought losing me would save him," she whispered, voice fragile, exhausted, and then the world went black, the reset triggering, the cycle terminating, the life she'd never truly lived being erased from the Tower's memory, Ayato left believing he'd failed to save her, Kazuki left believing he'd done it for the right reason.
The vault shook violently, the walls cracking like the Tower itself was fracturing under the weight of this memory. The system chimed with a shrill, urgent warning:
[WARNING]
Cycle Echo Overflow: 81%
Identity divergence imminent
Memory rejection impossible
Thousands of memories flooded outward—Kazukis, Kazukis, every version of him, every betrayal, every death, every fragile moment where he'd tried to be the one who stayed sane, the one who stayed strong, the one who stayed silent. Then, faintly, as if the world itself was bending, Ayato's voice echoed from outside the vault, somehow piercing the madness:
"Kazuki!"
The sound hit him like a hand reaching through the dark, the first real thing he'd felt in seconds, the first thread that hadn't been consumed by the storm. He clung to it, the echo giving him enough of a tether to the world to stand, to breathe, to drag himself back inch by inch toward the present, away from the endless loop of regrets.
Kazuki rose slowly, tears burning down his face, the echo of his heartbreak and guilt etched into every pore. "So that's why you hated yourself so much, Ayato," he whispered, the memory now a permanent scar in his mind. "You remember failing to save Yui. I remember choosing her death to 'save' you."
Two different guilt threads, one shared tragedy, the Tower's cruel joke, a tragedy woven into the very fabric of their existence.
The vault's final message appeared:
[TRUTH INTEGRATED.]
New Trait Acquired:
🔸 Original Sin Bearer
– You retain memory others reject
– Emotional burden strengthens Karma resistance
– High risk of corruption during emotional spikes
Kazuki stepped back into the elevator, the door sliding shut behind him, the memory of the Vault fading but the echo of the truth remaining, a permanent fixture in the quiet space between his ribs. Everyone looked at him immediately, the weight of his gaze settling on their faces like a shadow.
Ayato's eyes tightened, the unreadable intensity in his gaze faltering only by a fraction. "What happened in there?" he asked, voice low but insistent.
Kazuki stared at him, the memory of Yui's face, the echo of his own betrayal, the understanding flooding Ayato's eyes—that look of terror, the realization that the guilt Kazuki bore wasn't just for his own sins, but for the ones he'd woven into the very fabric of the Tower itself.
"I remembered why this Tower started breaking us," Kazuki said quietly, the weight of those memories heavier than any burden he'd carried before. "The Tower didn't just break us, Ayato. It broke because of us. Because of what we chose, what we failed to choose, what we let die, and what we thought we were saving."
The elevator doors slid closed, the hum of the descent returning, the Tower continuing to burrow deeper into the truths it had tried to lock away, the memories that should never have survived. Kazuki closed his eyes, the weight of the Original Sin Bearer pressing down like a mantle around his shoulders, the echo of the Tower's laughter mixing with the memory of the girl he'd sent to die to save the boy who'd never truly forgiven himself for letting her go. The guilt wouldn't leave him; it was a part of him now, the scars that had been carved into the very foundation of the Tower, and the knowledge that, somehow, the only way forward was to carry all of it—truth, pain, forgiveness, and the faint, fragile hope of making something better out of the wreckage.
(Chapter 36 End)