Chapter 15

ｎｏｗ ｌｏａｄｉｎｇ．．．

“残り火” 

Nokoribi 

「 ｖｅｒｉｆｉｅｄ」

The morning following Rengoku’s departure felt brittle, the air in the Butterfly Mansion heavy with the ghost of his boisterous laughter.

You found Shinobu already entrenched in the laboratory, the clinical scent of medicinal herbs and distilled alcohol clinging to her like a second skin.

This was not unusual.

What was unusual was the way she looked up when you entered, not the polite acknowledgment she gave everyone, but something sharper.

More expectant.

Like she had been waiting for you specifically.

“You’re up early,” you said, settling onto your stool.

“I didn’t sleep.”

You studied her as you took your seat. The faint shadows beneath her eyes spoke of a night stolen by thought, and her hair flowed freely over her shoulders, absent of the iconic butterfly ornament. Despite the exhaustion, her hands remained impossibly steady as she scribbled frantic, meticulous notes into a half-filled journal.

“The compound held,” she announced, her voice a quiet anchor in the room. “Eighteen hours without degradation. It’s a new record.”

Leaning over, you peered into the vial suspended in the water bath. The sediment was a perfect, uniform suspension—neither separating into its parts nor collapsing into useless sludge.

Just… stable.

“Eighteen hours,” you repeated. “That’s—”

“It’s still not enough.” She capped her pen with a definitive snap. “But it’s progress. If we can stretch that window to seventy-two hours, we can talk about field deployment. For now, it’s a fragile miracle… Too experimental to trust with a life.”

“But we’re closer.”

“Closer, yes.” She looked at you, and for a fleeting second, the Hashira vanished, replaced by someone small and profoundly vulnerable. “We have two weeks.”

“Two weeks until what?”

“Until Rengoku-san leaves for the Mugen Train,” she said, the words falling like cold stones. “The dispatch came at dawn. He’ll be departing from here, and the boys have been assigned to support him.”

Two weeks.

You’d known it was coming. You’d been counting the days since the crow’s announcement. But hearing it spoken aloud made something cold settle in your chest.

“Two weeks,” you said. “That’s not enough time.”

“It is the only time we are granted.” She turned back to her work, her profile hardening back into marble. “So we work.”

· · ─────── · 𓅪 · ─────── · ·

The first week dissolved into a frantic blur of failed temperature cycles and the persistent hiss of the Bunsen burner.

You learned things about Shinobu that the anime had never shown you.

The way she tapped her pen against her teeth while thinking.

The way she said “interesting” in a tone that could mean anything from this is promising to this is a disaster and I’m too polite to say so.

Most of all, you noticed her self-neglect; she would simply cease to exist outside the chemistry unless you forced a cup of tea into her hands and stood over her until she drank.

“You’re very persistent,” she said on the third day, lifting the teacup with both hands.

“You’re very stubborn,” you countered, returning to your stool. “I’m just here to ensure you don’t reach your breaking point.”

“I’m a Hashira. I don’t collapse.”

“Everyone collapses eventually.” You kept your gaze fixed on the water bath, monitoring the temperature as it ticked up degree by degree, refusing to meet the intensity of her eyes. “Even Hashiras.”

The silence that followed was different from the silences you’d grown used to. This one was heavier. Loaded with something you couldn’t name.

“Where did you learn to care like this?” Shinobu”s voice finally cut through the quiet, quiet enough that it was almost a whisper.

You looked up. She was watching you over the rim of her cup, her violet eyes steady and unblinking, reflecting the lamplight like twin pools of wisteria moonlight. A quiet, searching gaze.

“What do you mean?”

“You worry about everyone. The boys. Aoi. The girls. Me.” She set the cup down, the gentle clink echoing in the quiet room. “You’ve been here less than two months, and you act like you’ve known us for years. Like… like we’re already yours.”

The word yours struck a chord deep in your chest, vibrating in a place you hadn’t realized was so hollow.

“Maybe you are,” you said, the words slipping out before you could stop yourself.

Shinobu’s breath caught.

Her breath hitched—a tiny, sharp intake of air. Her knuckles whitened as she gripped her cup, but she didn’t retreat. There was no witty redirection, no porcelain smile to hide behind.

She simply let the moment exist.

She just looked at you.

“That’s a dangerous thing to say,” she murmured.

“I know.”

“To a Hashira.”

“I know.”

“To me.”

You held her gaze. The water bath cycled, and the temperature ticked up, yet neither of you moved.

“I know,” you said again.

Shinobu cast her gaze down at her tea, a subtle but distinct shift occurring in her expression. It wasn’t a withdrawal, but rather a settling, as if she had come to a silent, private conclusion.

“We should check the fourth cycle,” she finally said.

“We should,” came the reply.

Still, neither of you made a move to stand.

· · ─────── · 𓅪 · ─────── · ·

It was five days into the second week when you finally heard her laugh—truly laugh. Not the melodic, artificial hum she used for social grace, but a sudden, jagged burst of genuine amusement.

That day, you were attempting, with miserable results, to explain the concept of pH to her. The effort was a failure, a conspiracy of obstacles: the language barrier, the hundred-year time gap, and the sheer impossibility of defining a measurement system that was still decades away from standardization.

“So the ‘peach’ of the solution—”

“pH,” you repeated, rubbing your temples. “It doesn’t matter what it stands for, honestly. Think of it as a ruler for how much a solution wants to burn you versus how much it wants to… well, be soapy.”

“I know what acidic means.”

“Right, but it’s a specific scale. Zero to fourteen. Seven is the middle, perfectly neutral. Anything lower is an acid; anything higher is a base.”

Shinobu stared at you. “Fourteen?”

“Yes.”

“That’s—” She paused. “That’s a very specific number.”

“It’s based on the concentration of hydrogen ions.”

“Hydrogen what?”

You opened your mouth. Closed it. Rubbed your face with both hands.

“Ions,” you said weakly. “You know what ions are. Charged particles. Arrhenius. Dissociation in solution. It’s—” You gestured helplessly at the air. “It’s the same chemistry. Just… organized differently.”

Shinobu tilted her head. Her expression was unreadable, but there was a glint in her eye that you were starting to recognize.

“So you’re telling me,” she said slowly, the amusement beginning to leak into her voice, “that wherever you’re from, you’ve taken complex chemical dissociation and turned it into a numbered yardstick for children?”

“Yes.”

“And this scale can tell you, precisely, the strength of any acid or base.”

“In theory. If your measurements are accurate.”

“And you just… know this. Off the top of your head. Like it’s common knowledge.”

“Well, teenagers mostly. It’s basic science back… where I’m from.”

She stared back.

“Children,” she repeated.

“Teenagers. Young ones.”

She was silent, her mind likely reconciling her years of painstaking mastery with the idea of a classroom full of bored adolescents learning the same fundamentals.

Then, the dam broke.

Then she laughed.

Not the pleasant mask.

Not the sharp, surprised sound from the training ground.

It was a bright, unguarded sound. She pressed a hand over her mouth as if trying to physically shove the laughter back inside, her shoulders shaking with the effort.

“You’re serious,” she managed, her shoulders shaking.

You couldn’t stop your smile from forming, “Completely.”

“Children learn this?”

“Teenagers,” you corrected weakly. “And not all of them remember it. I barely remember it. I’m probably explaining it wrong.”

She laughed again, softer this time, and shook her head. The butterfly ornament in her hair caught the lamplight and glinted.

“You’re the strangest person I’ve ever met,” she said.

“I know.”

“I mean it as a compliment.”

“I know that too.”

The laughter eventually ebbed, but the smile remained—private, real, and softening her features in a way that made your heart skip. She looked at you with an expression that sat somewhere between wonder and absolute exasperation.

“A scale from zero to fourteen,” she murmured, almost to herself. “Based on hydrogen ion concentration. And children learn this.”

“Some of them. The ones who pay attention.”

“I would have paid attention.”

“I know.” You smiled. “You pay attention to everything.”

She held your gaze for a heartbeat too long before turning back to her notes, her pen flying across the page as if she were capturing a fleeting thought before it could vanish.

“Show me the rest,” she said. “The parts you remember. Even if they’re incomplete.”

“That might take a while.”

“We have two weeks.”

You pulled your stool closer.

· · ─────── · 𓅪 · ─────── · ·

The sixth day brought a breakthrough.

Inside the laboratory, the air was thick with the sharp, earthy scent of processed wisteria and the low, rhythmic hiss of the burner. You stood beside Shinobu, both of you hovering over the workstation as if a sudden movement might shatter the fragile reality before you.

The previous five days had been a cycle of frustration—the protein scaffold collapsing like wet paper time and again.

But then, Shinobu had paused, her violet eyes narrowing as she looked at the spent blossoms. She had suggested the roots instead, the deep, resilient anchors of the plant rather than its delicate crown.

It was the missing piece.

As the new solvent, derived from the wisteria roots, mingled with the compound, the transformation was visceral. You held your breath as the mixture swirled, waiting for the telltale cloudiness of failure, but it remained clear, settling into a clarity that felt almost holy.

The compound finally held.

Not for eighteen hours. Not for twenty-four.

It held for thirty-six hours. Then forty-eight.

You were both staring at the vial, watching the clear liquid settle, when Shinobu spoke.

“…This is it,” she breathed out, the sound thin and fragile as glass. “This is what we’ve been fighting for.”

“It’s not finished,” you whispered, the words tasting like ash.

“This is it.” She carefully lifted the vial, holding the tiny tube of liquid up to the weak lamp. The liquid within shimmered, catching the light with a faint, ethereal violet glow, a captured promise. “If we can replicate this synthesis… if we can scale this…”

“It’s a field solution,” you finished, the reality sinking in.

“We’d have something we could test in the field.”

“Something Rengoku-san could carry with him on the train.”

You watched her. Her hands, usually steady as a surgeon’s, were trembling just a fraction as she held the delicate glass—the only betrayal of the profound emotional storm brewing beneath her calm facade.

“Shinobu,” you said, your voice barely audible.

She didn’t look at you, her gaze fixed on the violet light.

“Shinobu,” you pressed, softer, firmer. “We have a week. That’s enough time for final tests. To ensure it’s stable.”

“A week isn’t enough time for a lifetime of work,” she replied, her voice dangerously quiet. She set the vial down with agonizing, almost religious care. “But it is the only week we are granted. We will make it enough.”

“We’ll use every minute,” you agreed.

She finally turned, her eyes bright, shimmering with a volatile, desperate, fragile hope that she seemed almost afraid to touch.

“Do you really think this could work?” she asked, her voice an uncertain plea.

“I think it’s the best chance we have.”

“That’s not an answer.”

You offered a small, gentle smile, a reassurance for both of you. “It’s the only answer I have left.”

A long silence followed, stretching thin over the rhythmic hiss of the burner. Slowly, she reached out, and her cool, deliberate clasp took your hand, palm to palm—a raw act of seeking contact, unlike her usual careful distance or mere brush of fingers.

“Thank you,” she finally whispered into the quiet air.

“For what?”

“For not giving up,” she replied. Her thumb traced a slow, cool circle on the back of your hand. “For staying. For… for making me believe this might matter.” She swallowed hard, the slight movement catching your eye.

“It does matter.”

She looked down at your intertwined fingers, her voice dropping to a jagged whisper. “Does it? I have spent my life honing poisons to kill demons more efficiently, and yet, not a single drop of it has brought me one inch closer to what I actually want.”

“What do you actually want?” you asked, tightening your grip gently.

“I want to stop the loss,” she confessed, her lips trembling visibly. “I want to wake up without the dread of the crow’s announcement. I want my sister back. But since the world won’t grant me that impossible gift, I will settle for ensuring no one else has to carry this weight.”

“That isn’t settling, Shinobu,” you argued, your voice firm. “That’s defiance. That’s fighting with everything you are.”

“You say things like that,” she murmured, “and I don’t know what to do with them.”

“You don’t have to do anything,” you said. “Just… be here. With me. That’s enough.”

She stared at you.

The lab was silent, save for the rhythmic hum of the water bath and the distant, cheerful laughter of the girls elsewhere in the mansion. It felt like a bubble, protected from the harsh reality outside.

“I don’t know what to make of you,” she said finally. “You arrived with impossible knowledge and injuries that shouldn’t have mended, and yet… I… I don’t want you to leave.”

“I’m not going anywhere.”

“You might not have a choice.”

“Then I’ll stay as long as I can.”

She held your gaze for a long moment. Then, very softly, she said: “That’s not enough.”

“It’s all I have. It’s all any of us have.”

She didn’t let go of your hand.

Neither did you.

· · ─────── · 𓅪 · ─────── · ·

The second week was harder.

The final week was a grueling test of endurance. It wasn’t just the complexity of the chemistry, but the psychological weight of the approaching deadline. Every sunrise felt like a countdown, every sunset a reminder of time slipping through your fingers like sand.

You practically lived in the lab, driven by a desperate need to be useful. In the silence of the work, you could almost ignore the crushing anxiety of the future you already knew was coming.

“You’re here again,” Shinobu said on the tenth day, not looking up from her notebook.

“I live here now.”

“You have a futon in the ward.”

“The ward doesn’t have a water bath.”

She looked up, a small, weary smile playing on her lips. “You’ve become obsessed.”

“I’m dedicated.”

“Same thing.”

“No, dedication is when you care about the work. Obsession is when you forget to eat.” You gestured at the tray of food Aoi had left an hour ago, still untouched. “Which one is this?”

Shinobu looked at the tray. Then at you. Then back at the tray, a slight crease forming between her brows.

“…Obsession,” she admitted, her voice flat.

You swore you could have seen her pout.

Must have been the wind.

“Eat,” you instructed softly.

“I’m not hungry.”

“Your stomach disagrees. It’s been making faint protests for the last hour.” You picked up the tray and carried it to the workbench, setting it down beside her notebook. “You’re going to collapse, and then I’ll have to carry you, and I’d rather not.”

“I’m a Hashira. I don’t collapse.”

“Everyone collapses eventually.” You pulled the lid off the rice bowl. The steam rose, smelling faintly of sesame and ginger. You picked up the chopsticks. “Even Hashiras.”

She watched your hands—the simple, deliberate action of preparing the food—with an unreadable, intense focus. “What are you doing?”

“Helping.”

“I don’t need help eating.”

“Then eat,” you challenged, holding out the bowl.

She didn’t move. She just watched you.

You sighed, exasperated and fond in equal measure. “Shinobu.”

“I’m working.” Her voice was quiet, but firm.

“The compound isn’t going anywhere. Your health might.” You selected a perfect, crisp piece of pickled daikon from the tray, holding it between the tips of the chopsticks. It was a subtle, almost intimate act.

She opened her mouth to argue, but you were already holding the food out, keeping your eyes steady on hers.

“Here.”

She stared at the offering, and then at the small gap between the chopsticks and her mouth. She didn’t move.

“_____-san—” she began, a note of warning in her tone.

“Open.”

You held your breath, letting the silence stretch. It wasn’t a demand, but a quiet, non-negotiable expectation. A delicate balance of control.

Her eyes widened, catching the lamplight. A faint, dusty rose flush spread across her cheeks—a sight so rare you hadn’t thought it possible. For a moment, the untouchable Hashira was just a flustered woman, caught off guard by a simple, overstepping gesture of care.

“I’m not a child,” she finally whispered, but her voice had lost all of its sharpness, turning thin and reedy.

“You’re acting like one. Prove you’re not,” you murmured back, your voice equally low. “Eat.”

She hesitated, her analytical mind fighting the physical intimacy of the gesture. Her gaze flickered to your lips, then back to the pickled vegetable. Then, slowly, with a small exhale of surrender, she leaned forward and accepted the bite. Her eyes finally dropped to the floor, her eyelashes brushing her cheeks in a rare display of bashfulness.

You watched her chew, watched her swallow, watched the way she refused to meet your eyes afterward. The flush had deepened, spreading to the tips of her ears.

“There,” you whispered, your hand still hovering near her face. “The world didn’t end.”

“You’re insufferable.”

“You’re blushing.”

“I am not—” She pressed her hand to her cheek, realized what she was doing, and dropped it immediately. Her glare was withering, but the effect was somewhat undermined by the fact that she was now very deliberately not looking at you. “This is entirely your fault.”

“I just fed you a vegetable.”

“You ambushed me.”

“I offered. You accepted.”

“I—” She stopped. Pressed her lips together. The flush was spreading to her neck now, and she seemed to be having a profound internal crisis about whether to flee or pretend nothing had happened.

You’d never seen her like this. Shinobu, who was always composed, always in control, always three steps ahead—sitting here with pink cheeks and a flustered expression, unable to meet your eyes.

It was… adorable.

“You’re staring,” she said.

“I’m observing.”

“Stop observing.”

“Never.”

She made a soft sound—halfway between a laugh and a sigh—and hid her face in her palms. “What is it about you that does this to me?”

“Making sure you don’t starve.”

“This isn’t—” She lowered her hands, but her cheeks were still flushed. “This isn’t how I expected today to go.”

“How did you expect it to go?”

“Not… this.” She gestured vaguely at the space between you. At the chopsticks still in your hand. At the tray of food that was slowly going cold. “Not this.”

You set down the chopsticks and picked up the tea cup instead, holding it out to her. She took it this time—no hesitation, though her fingers brushed yours and she flinched like she’d been burned.

“You’re very strange, ______-san,” she murmured into the cup.

“You’ve mentioned that.”

“I mean it differently each time.”

“How do you mean it this time?”

She looked at you over the rim of the cup. The flush was fading, but something else had taken its place—something softer, more uncertain. Like she was seeing you for the first time.

She watched you over the rim of the cup, her eyes softening into something more vulnerable and uncertain than you had ever seen. “I mean it like… I don’t know where I end and you begin anymore. And I’m not sure I’m ready to find out.”

“That’s a very Shinobu way of saying you like having me around.”

“I didn’t say that.”

“You didn’t have to.”

She looked away first. Shinobu Kocho, who never looked away from anything, turned her gaze to the water bath and watched the temperature tick up degree by degree.

“Eat the rest of your food,” you said, picking up your own cup of tea. “I’ll check the cycle.”

She didn’t argue.

And when you glanced at her a moment later, she was eating—slowly, deliberately, with her free hand pressed flat against her thigh.

The same way you did when you were trying not to fall apart.

You didn’t mention it.

· · ─────── · 𓅪 · ─────── · ·

The trio found you in the garden on the twelfth day.

The twelfth day felt like a single, drawn-out breath before a blow. The frantic energy of the laboratory had become too much, pushing you out into the heavy silence of the garden.

You were seated beneath the ancient wisteria, trying to find solace in the falling petals—a slow, violet rain that failed to cleanse the crushing weight of your foreknowledge.

You watched the blossoms drift like slow-motion snow, desperately attempting to drown out the intrusive thoughts of steam, cold iron, and the coppery, metallic scent of blood on the coming wind. It was there, a figure of solitary dread amidst the beauty, that the trio finally materialized.

Tanjiro arrived first, his footsteps silent on the grass. He had a way of materializing beside people who needed company, his presence warm and steady like woodsmoke.

He settled onto the ground beside you with an ease that made the world feel, if only for a second, a little less precarious.

“______-san,” he said softly. “You’ve been hiding.”

“I’ve been working,” you replied, your voice sounding small even to your own ears. “Helping Kocho-san with something important.”

“You’ve been hiding in the laboratory.” He said it without accusation. Just observation. “…Is it about the Mugen Train?”

You looked at him, heart hammering. He was so young, so earnest, yet beneath that kindness lay a quiet, steely resolve that felt like a premonition of the hero he was destined to be.

“The dispatch mentioned it,” he said. “We’re supposed to meet Rengoku-san there. To assist.”

“You’re going with him?”

“Zenitsu, Inosuke, and me.” He nodded. “We leave in two days.”

Two days.

You’d known. Of course you’d known. But hearing him say it—hearing him say it—made it real in a way it hadn’t been before.

“Tanjiro—”

“We’ll be careful.” His smile was gentle. “I know you worry. Your scent changes when you’re worried. It gets sharper. Like something burning.”

“I know you will be.” You buried your face in your hands, the weight of your foresight finally starting to crush you. “That isn’t what keeps me awake at night.”

“Then what are you worried about?”

The question hung in the air between you.

The words you wanted to say were trapped in your throat: I’m afraid of the upper moon. I’m afraid of the sunrise that will come too late. I’m afraid of the smile that will never reach Rengoku’s eyes again.

I’m worried because I’ve seen how this ends.

“Just—” You swallowed. “Just come back. All of you. Come back.”

Tanjiro studied your face for a long moment. Then he nodded, slow and serious, the way he did when he was making a promise he intended to keep.

“We will,” he said. “I promise.”

And because it was Tanjiro, because Tanjiro had never broken a promise in his life, you almost believed him.

Zenitsu found you next.

Zenitsu didn’t approach so much as collapse into a heap of yellow fabric and frantic energy, his whimpers cutting through the serenity of the garden like a jagged blade.

“Zenitsu-kun.”

“I’m going to die,” he announced. “On a train! In the dark! With demons! I’m going to die, and no one will even know because my body will be eaten and—”

“Zenitsu.”

“—and Tanjiro is so calm about it, which means he doesn’t understand the gravity of the situation, which means I’m the only one who truly appreciates how doomed we are, and—”

“Zenitsu!”

He fell silent then, his frantic breathing hitching as he looked up at you with eyes that were perpetually swimming in a sheen of unshed tears.

He looked so small beneath that oversized haori, a boy caught in a world of giants and monsters, trembling at the mere thought of the shadows lengthening across the garden.

“You’re not going to die,” you said.

“You don’t know that.” He exasperated.

“I know that you’re stronger than you think you are,” you countered, holding his gaze with a fierce certainty you hoped he’d absorb. “I’ve seen it. Even if you haven’t.”

He stared at you, his mouth hanging open in a silent, stunned gape. He opened it to protest, closed it, and then opened it again, like a fish gasping for air.

“That’s—” He swallowed hard, the movement of his throat visible in the twilight. “That’s exactly what Tanjiro says. Why do you both say such impossible things?”

“Because Tanjiro is usually right about the heart of a person,” you murmured, offering him a small, sad smile.

“But—”

You reached out, placing a firm hand on his shoulder. He practically vibrated beneath your palm, his terror a physical hum that traveled up your arm. “Zenitsu. Listen to me. You are going to go, you are going to fight with every ounce of strength you have hidden away, and then you are going to come back here. I won’t accept any other ending.”

“But what if I’m not enough?” he whispered, the question raw and bleeding.

“No.” You shook your head, cutting him off before the doubt could take root. “No ‘what ifs.’ You’re going to come back. I need you to come back. All of you. This mansion would be too quiet without your noise.”

He was quiet for a moment. Then, very softly, he said: “You talk like you’re losing something.”

You looked away, focusing on the wisteria blooms that seemed to droop under the weight of the coming night, already mourning a future that hadn’t yet arrived. “I am,” you confessed.

“What are you losing?” he pressed, leaning in.

The words remained locked behind your teeth. You couldn’t tell him about the train, about the fire, or about the sunset Rengoku wouldn’t see.

You just shook your head slowly.

Zenitsu didn’t push. For all his cowardice, he was attuned to the frequency of a breaking heart. He saw the way your knuckles were white from gripping your robes, the way you looked at the horizon as if it were a closing door.

He reached out, his hand hovering near yours for a second before he pulled it back, settling for a quiet, shared space beneath the trees.

You forced yourself to look at him, meeting his dry, serious gaze. For a fleeting moment, the farce was gone, and you saw the Slayer beneath the boy—the one who could move like lightning when the world went dark.

“I think it’s the waiting that’s the hardest part,” you said, trying to find a truth that wouldn’t betray your secrets.

Zenitsu nodded, once, and didn’t say anything else.

But he didn’t leave either.

And then came the thirteenth day, when the quiet was shattered by a whirlwind of aggression and coarse fur.

Inosuke didn’t so much announce himself as he did impact the world around you. He tackled you into the damp grass, a chaotic mess of muscle and boar-hide that effectively jarred your mind away from its grim ruminations.

“WEIRD-CLOTHES!” he roared, his voice echoing off the mansion walls.

You rolled through the dirt, your instincts flaring as you came up into a defensive crouch, only to find yourself staring into the wide, unblinking eyes of a boar mask.

“Inosuke,” you sighed, your heart rate slowly returning from its spike. “What do you want?”

“FIGHT ME!” he demanded, his fingers twitching toward the hilts of his jagged blades.

“No. Not today.”

“FIGHT ME!”

“You ask this every single day, Inosuke. The answer is still no.”

“AND EVERY DAY YOU SAY NO! BUT TODAY IS DIFFERENT! TODAY YOU SAY YES!” He huffed, steam curling from the snout of his mask as he loomed over you.

You stared at him, exhausted. “Why? Why today of all days?”

Inosuke tilted his head, a sharp, predatory movement that lacked any of the social grace found in the others. “Because you’re stinking up the whole place with your sadness,” he grunted. “Even the crows are avoiding this garden because of that smell.”

“I’m not—” you began, but he cut you off with a harsh noise.

“Fighting makes the brain go quiet,” he said, offering a primitive, absolute wisdom that took you by surprise. “When the world gets too loud or too heavy, I fight. It’s the only way to remember that I’m still here.”

“Remember what, exactly?”

“That I’m alive!”

The words struck a chord. You looked at the wild boy before you and realized his aggression was an act of mercy; he was trying to save you from your own thoughts.

He was going to survive that train, you realized. He was too stubborn to do anything else.

But standing there in the fading light, his boar-head tilted in anticipation, he just looked like a boy who was also trying to outrun his fears.

“Okay,” you said, your voice gaining a sudden, sharp edge. “Okay, Inosuke. I’ll fight you.”

He let out a triumphant battle cry and launched himself forward.

The ensuing struggle was brutal, messy, and exactly what you needed. You rolled in the dirt, the scent of crushed grass and sweat filling your senses, pushing your body until your lungs burned and your thoughts finally, mercifully, went dark. When it was over, you lay flat on your back, staring up at the emerging stars.

Inosuke flopped down beside you, his bare chest heaving with exertion. “Better?” he grunted.

“Yeah,” you whispered. “A lot better.”

“Good.” He punched your shoulder—hard enough that it would definitely leave a bruise, but for him, it was a gesture of profound affection. “Now you owe me a real fight. When I come back from this train thing.”

“When you come back?” you repeated, the word hanging in the air like a promise.

“Obviously!” He snorted. “You think some hunk of metal and a couple of demons can beat the Great Inosuke?”

You smiled then. It was small and weary, but it was the first real smile you’d felt in days. “No,” you said. “I don’t think anything can beat you.”

“GOOD.” He sat up, punched the air with a savage grin you couldn’t see but could certainly feel, and then promptly dropped back down. Within thirty seconds, the rhythmic, heavy snoring of a content beast filled the garden.

You remained there long after he eventually woke and wandered off, staring at the constellations. The weight of your knowledge hadn’t vanished, but for the first time, it didn’t feel like it was going to drown you.

It all felt so strange—this life, these boys, and the terrible, beautiful world they were fighting to save.

When it was over, you lay on your back in the grass, staring up at the darkening sky.

Inosuke flopped down beside you, his chest heaving.

“Better?” he asked.

You turned your head to look at him.

“Yeah,” you said. “Better.”

“Good.” He punched your shoulder—lightly, for him, which meant it only bruised a little. “Now you owe me a real fight. When I come back.”

“When you come back?”

“Obviously.” He snorted. “You think a train demon can beat me?”

You smiled. It was small and tired and probably didn’t reach your eyes, but it was real.

“No,” you said. “I don’t think anything can beat you, Inosuke.”

“GOOD.” He sat up, punched the air for emphasis, and then, without warning, dropped back down and closed his eyes.

Within thirty seconds, he was snoring.

You lay in the grass long after he was gone, staring at the stars. The weight of your knowledge was still there, but for the first time, it didn’t feel like it was going to drown you.

It all felt so strange.

· · ─────── · 𓅪 · ─────── · ·

The garden was quiet again. The wisteria petals were a thick, violet carpet, and the heavy silence of the mansion had returned, absorbing the last echoes of Inosuke’s snoring. The adrenaline from the brief, brutal fight had ebbed, leaving you hollowed out and aching, both physically and psychologically.

You walked back through the halls, the polished wood reflecting the distant lamplight like still water.

You didn’t go to the ward.

You went to the laboratory.

The door was ajar, a thin slice of light escaping into the dark corridor. The room was humming with its usual low, rhythmic energy—the soft hiss of the burner, the tick of the temperature gauge.

Shinobu was at the workstation, exactly where you expected her to be. She wore a simple dark robe over her uniform, her hair tied back loosely with a scrap of white cloth, and she was meticulously labeling a rack of sterile vials. She didn’t look up when you entered, but her hand paused, just for a moment, betraying that she had heard you.

“Your back is bleeding,” she noted, her voice flat, clinical.

Ah, back to the Hashira mode…

“Inosuke’s idea of a hug,” you replied, leaning against the doorframe.

“Aoi is asleep.”

“I know.”

She sighed, a quick, impatient sound. She capped the pen and placed it down with precise movements. “Sit down.”

You didn’t argue. You crossed the room and sat heavily onto your usual stool.

She turned to the cabinet, retrieving a small, square bottle of disinfectant and a roll of fresh gauze. The chemical smell of the lab—her scent—was a welcoming note.

“Take off your samue,” she instructed, her tone brooking no argument.

“Shinobu, it’s fine. It’s just a few scratches.”

“I don’t leave injuries to fester, ______-san. Especially those inflicted by a wild boar attempting rudimentary social interaction.” Her eyes, when they met yours, were sharp and violet, holding a fierce, uncompromising demand. “If you make me repeat myself, I will use the needle.”

You winced when you heard her threat.

You slowly pulled the dark blue garment over your shoulders, wincing as the fabric pulled against the drying wounds.

Shinobu stood behind you, and her touch, when it came, was feather-light, almost hesitant. She peeled the rest of the shirt away, her cool fingers brushing the hot, scraped skin.

“Be still,” she murmured.

The disinfectant, when she applied it, stung—a sharp, immediate shock that made you suck in a breath. But her touch was a masterful blend of efficiency and care. She cleaned the deepest lacerations first, her movements economical, never lingering unnecessarily, yet somehow conveying an absolute focus that felt profoundly intimate.

“You should not have fought him,” she said.

“He needed to fight.”

“And you needed to be thrown around in the dirt?”

“I needed to stop thinking about the compound,” you confessed, the words quiet and low, meant only for her. “And the train. And the sunrise that’s two days away.”

She stopped cleaning. Her hands rested on your bare shoulders, one on each side, her thumbs resting just beneath the curve of your neck. Her breath ghosted against your ear.

“Don’t do that,” she whispered.

“Do what?”

“Speak the dread aloud.”

“…It doesn’t make it less real.”

“It makes it harder to work.” She took a shallow breath, and you felt the slight shift of her weight behind you. “We’re close. The compound is stable. Seventy hours in the water bath and it hasn’t separated. I think—” She paused, and the words caught, as if she were afraid to finish the thought. “I think we’ve done it.”

The news hung in the air, electric and fragile. Seventy hours. Just enough time for them to prepare the final dose.

“Then we have a chance,” you whispered, your throat suddenly tight.

“A chance.” She lifted her hands, carefully placing a thin layer of medicated balm over your wounds. “A razor-thin chance, held together by wisteria root and two weeks of sleepless nights. Don’t waste it by letting that boy tackle you.”

“I won’t.”

She finished bandaging your back. Her hands were careful, precise, the gauze wrapping around your torso snugly. When she was done, she stepped back, and the sudden loss of her warmth made the room feel cold.

You turned on the stool to face her.

She was watching you, her usual pleasant mask slightly cracked, the violet of her eyes dark with exhaustion and something heavier.

“What are you going to do now?” you asked.

“Replicate the synthesis.” She crossed her arms, folding her hands into her sleeves—a familiar, defensive gesture. “Scale it up. Prepare the final dose.”

“And then?”

“Then Rengoku-san leaves,” she said, the name falling flat between you. “And we wait.”

You slid off the stool and walked to her. You stopped just inches away, close enough that she would have to step back or hold her ground. She held her ground.

You reached out, your fingers finding the cool, smooth silk of her robe. Your hand slid up her arm and rested on her shoulder, directly over the spot where her muscles were perpetually, rigidly tense.

“You don’t have to carry it all by yourself,” you murmured.

“I’m a Hashira.”

“You’re a person.”

She looked at you, and the fragile composure finally shattered. Her lips parted, her eyes closing briefly as she inhaled sharply.

“Two days,” she said, her voice shaking. “Two days, and the three boys—the kindest, loudest, most impossible boys—are going to walk onto a piece of cold iron that is carrying a monster. And I have to stand here. I have to stand here and wait for the crow.”

She didn’t cry.

Shinobu didn’t cry.

But the raw, aching dread in her voice was a louder confession than any tear.

You didn’t say anything. You just pulled her to you.

She resisted for a fraction of a second—the Hashira, the doctor, the woman who never allowed herself to be handled—but the resistance faded into an aching, complete surrender.

Her arms came around your waist, pulling you close, her face burying itself against your bare chest where the skin was still hot from the disinfectant. You wrapped your arms around her, holding her tightly, careful of the wound on your back, careful of her own fragile composure.

You felt the small tremor that ran through her body, the faint, desperate hitch in her breath.

“I know,” you whispered into her hair, the wisteria scent filling your senses. “I know.”

You held her for a long moment, swaying slightly in the quiet, chemical-scented air of the lab, two people sharing the impossible weight of a known future.

She eventually pulled back, slowly, deliberately, the surrender melting back into that familiar, guarded control. She didn’t meet your eyes. Her cheeks were flushed, her composure bruised but intact.

“You should sleep,” she said, her voice quiet and rough. She turned back to the workstation, her hands finding the familiar shape of a vial.

“I’ll stay here,” you replied. “I can’t sleep either.”

She didn’t argue.

“Then sort the discarded herbs,” she instructed, without turning around. “And try not to look at me like I’m already a ghost.”

“I’m just observing.”

“Stop observing.”

You found your samue and pulled it back on, covering the freshly bandaged scratches. You walked to the basket of spent materials and sat down to work.

The rest of the night was spent in that strained, fragile silence, punctuated by the scrape of your hands sorting dead flowers and the soft, rhythmic clink of Shinobu’s preparations—the last, frantic work before the world turned to fire and steam. You didn’t look at her, but you didn’t have to. You could feel her there, across the table, working with a desperate focus, anchored by your presence and the shared weight of the next two days.

You both worked.

You both waited.

And neither of you said a single word about the way you had held each other.

꩜

ᶻ 𝗓 𐰁

大正コソコソ噂話 — Taishō Kosokoso Iwasubanashi

The morning after the late night in the laboratory, Aoi Kanzaki found a single strand of violet hair stuck to the shoulder of your samue. When she went to retrieve new gauze, she noticed Shinobu-sama was now holding her left arm with her right hand in a precise, careful way, as if the arm had fallen asleep. Aoi decided to simply count the gauze instead of asking any questions. 

A/N

Hey, guys! How are you feeling about the story right now? I haven’t written in a while, so honeslty, I’m not that confident in my writing. But, hopefully, it all sounds good!

And if there are spelling errors, I’m so sorry huhuuu… I’m so busy with university, projects, and exams that even doing a beta read is time consuming.

QnA though! What’s your favourite moment from the story as of now? I would love to know what you guys think!

Love  you all, see you in the next chapterrrr hehe!