Chapter Text
The world hummed again, but it wasn’t quiet.
It pulsed with energy — power lines, engines, conversation — all the things Senku had dreamed of hearing again. Yet every sound felt half a note too sharp, a rhythm that no longer matched the one in his head.
Civilization had returned, and with it came isolation in new forms. Everyone had somewhere to be now.
François managed logistics for half the continent, Chrome ran a research district, Gen vanished between political councils. And Kohaku—
Kohaku had built something of her own: the new Defense Corps, a network of engineers and soldiers protecting trade routes and research outposts. She’d become a symbol, a name on reports and headlines.
And in all that time, he hadn’t seen her once.
Until today.
He caught himself straightening his lab coat before pressing the transmitter. Old habits. Old nerves.
“Hey, lioness, come in.”
Static crackled, then her voice — a little deeper than he remembered, still sharp at the edges.
“Well, I haven’t heard that in a while, scientist. Over.”
“Get your ass here. Reactor torch’s down.”
“Tch. Still can’t say please? Over.”
“Didn’t say I forgot how.”
Her laughter, low and quick, hit harder than he expected. For the first time in weeks, the lab didn’t feel empty.
When she arrived, the air seemed to shift with her.
She walked in wearing a half-zipped mechanic suit, gloves tucked in her belt, goggles resting against her throat. Her hair was longer now, darker near the ends — sun, soot, and years changing its gold. The sight hit him with a disorienting sense of familiarity and foreignness at once.
“Been a while, huh?” she said, stopping in front of him with that same confident grin.
“Two years, three months, nine days,” he said automatically.
She blinked. “You counted?”
“Data never lies.”
Her smile softened. “You missed me.”
He didn’t answer — which was answer enough.
Suika darted forward and hugged her waist. Chrome clapped her on the shoulder. François inclined their head. Gen only smirked, muttering, “And the lab’s oxygen levels just spiked.”
They ended up side by side beneath the reactor — like muscle and mind falling back into rhythm. The work was familiar, mechanical, grounding.
“Your coat’s cleaner than I expected,” she teased.
“Trying to set an example.”
“For whom? The machines?”
“Someone’s got to keep you civilized.”
They shared a laugh, the kind that had gone extinct for both of them lately.
When the last coupling refused to budge, she wedged herself underneath, arms deep in the machinery.
He stepped out to check the readings, calling over his shoulder, “Hold that line steady.”
“Got it.”
Her voice echoed faintly from below, the same pitch it had been on the day they first rebuilt fire.
That’s when Tori approached — one of the new recruits, eager, naive, and oblivious.
He leaned on the railing above her, tone dripping with misplaced charm.
“So you’re the Kohaku everyone talks about. The famous warrior scientist. I’ve read your reports—impressive stuff.”
She didn’t look up. “Appreciate it. Don’t lean over the hydrogen lines.”
He laughed awkwardly. “Right, right. Just saying, I didn’t expect the legend to be… well, this legendary.”
Gen muttered something in the corner; Chrome grimaced.
Tori crouched lower, trying for a smile.
“You and Dr. Ishigami must make quite the pair. He builds the world, you protect it—must get lonely though, huh? Two geniuses like that?”
Senku didn’t remember deciding to move.
One moment, he was across the room. The next, Tori was on the ground.
The crack echoed against steel.
Senku’s voice stayed level, too calm.
“She told you to step back.”
Silence swallowed the lab. François looked away; Gen exhaled a slow, knowing sigh.
Kohaku slid out from under the machine, eyes wide, half in shock, half in something else—something unreadable.
Then, the corner of her mouth tilted upward.
“Remind me never to piss you off, scientist.”
“Not a common occurrence,” he muttered, flexing his bruised hand.
Her grin widened. “Still… damn. That was hot.”
The entire lab froze.
Then laughter broke the tension — hers, bright and unrestrained. His followed a second later, quieter, rawer.
She fanned herself dramatically. “You’ve really changed. Violence looks good on you.”
He rolled his eyes, half smiling. “Don’t make it weird.”
“You already did,” she said, still laughing.
Later, when the others had gone, they stayed to finish the repairs.
Silence returned — but a softer kind.
“Pressure’s steady,” he said, tightening the last valve.
“Good.” She crouched beside him again, shoulder brushing his. “You always get quieter when something matters.”
He didn’t deny it.
When she noticed his hand again — the red swelling on his knuckles — she sighed.
“Still making sacrifices for science, huh?”
“For physics. Not philosophy.”
“Then humor me.”
She took his hand, turning it gently, her thumb grazing the bruised skin. The contact sent a small, precise shock through him — the kind no instrument could measure.
“You didn’t have to do that,” she said softly.
“I know.”
“Then why?”
He met her gaze. “Because I don’t like watching people underestimate you.”
For once, she didn’t have a comeback.
Instead, she wrapped the cooling cloth from her belt around his hand, tying it tight and neat.
“Still reckless,” she murmured.
“Occupational hazard.”
When the work was done, they stepped outside into the twilight. The city lights glowed faintly below the horizon, pale reflections of stars reintroduced to the sky.
She turned toward him, the wind catching her hair.
“Next time, scientist—try not to break your hand defending my honor. I’ll make sure you have to use it for something better.”
He raised a brow. “Oh yeah? What exactly would you use it for?”
For a moment, the world stood still. Her grin faltered into something smaller, real. Then she blew him a quick, shameless kiss, laughing as she walked away.
He blinked, stunned for a beat before laughter escaped him—louder than he meant.
“Dinner. Seven.”
She paused halfway down the steps, glancing back over her shoulder.
“Seven-thirty,” she said. “I’ll need time to pretty myself up for you.”
The words carried on the wind long after she was gone, soft and electric.
Senku looked down at his wrapped hand, flexing it once. It hurt a little less.
And for the first time in years, he realized the world didn’t just hum — it sang.