Hideo called at 1:17 a.m. and opened with, “I did it. I found it.”

  That was how it always started with him—like the world owed him an audience.

  I stared at the ceiling of my one-room apartment, phone pressed to my ear, and tried to decide if I hated him more for waking me up or for sounding happy.

  “It’s a weeknight,” I said. “People sleep.”

  “Not tonight.” His breath rasped against the mic. “You have to come. Now. If I wait until morning I’m going to crawl out of my skin.”

  I swung my legs out of bed. The floor bit cold through my socks. “Are you drunk?”

  “I’m lucid,” he snapped, then immediately launched into the kind of sentence that made professors nod and everyone else glaze over. “I ran my statistical selection model over a codon-filtered sequence space. Pushed the top candidates through plasmid vectors. And the phenotype evaluation—”

  “Hideo.”

  “—spit out something that shouldn’t exist.” He swallowed hard. “Please. Just… don’t make me do this alone.”

  That last line did what his jargon couldn’t. It dragged up an old memory, rough and splintery, like a fingernail caught on wood.

  A verandah plank. A warning. A voice thick with countryside grit.

  Don’t look under there.

  ***

  The first time someone told me there was an afterlife under a piece of wood, I was eleven.

  It was early summer, the kind of day that smelled like wet dirt and bug spray. I’d biked over to Hideo’s place after school, and the three of us—me, Hideo, and his cousin Itako—had ended up on the engawa with watermelon slices sweating on a tray.

  Hideo’s grandmother knelt by the sliding door, tapping one of the floorboards with her knuckles. She listened like the board might answer back.

  Dry sound. Hollow. And yet the air carried a dampness that didn’t match the weather.

  She pointed at the plank. “Under this board’s packed full of the other side.”

  Hideo rolled his eyes like he’d practiced it. “Grandma, stop.”

  I laughed because he laughed. Kids did that. It was easier than thinking too hard.

  Itako didn’t laugh.

  She leaned forward, black hair falling like a curtain, and traced the grain with the pad of her finger. She’d always been like that—jumping toward scary stories even while her shoulders crept up to her ears.

  “Other side like… a hole?” Hideo asked, half-mocking, half-curious.

  His grandmother’s gaze cut to him. She waited a beat, then spoke slower, like she was driving a nail.

  “Not a hole. A connection. This house was built here for a reason. Our job’s to keep the bad things from crawling out.”

  That was the moment my grin died. The woman didn’t sound like she was telling ghost stories. She sounded like she was talking about rats.

  She tapped the board again, harder. “Don’t you peek. It’ll pull you in.”

  Itako’s finger paused. “Pull you in where?”

  The old woman’s mouth tightened. “Where it’s cold.”

  Hideo snorted. “Sure. The board is a magic door.”

  His grandmother didn’t rise to it. She just said, flat as a shovel strike, “A board’s a gate. A gate stays shut.”

  The plank looked normal. Sun-bleached, a little warped at the edge, dust gathered in the seam.

  Still, when my hand brushed it later, it felt cold. Not “shade-cool.” Cold like something had been pressed against it from underneath for a long time.

  More than a decade passed, and I never forgot that chill.

  ***

  The university at night had its own ecosystem.

  The front gate was locked, but the side entrance card reader glowed, and a handful of windows in the research building stayed lit like watchful eyes. People with real jobs slept. Scientists and grad students ran incubators, fed lab mice, and chased deadlines that didn’t care about daylight.

  I parked my electric bike behind the building, peeled off my helmet, and watched my sweat turn to gooseflesh in the wind.

  It was supposed to be early summer. Instead, the cold kept sneaking in like a bad habit.

  Hideo opened the lab door before I could knock twice. He grabbed my sleeve and pulled me inside as if something might follow.

  He looked worse than he sounded—eyes bright, face waxy under LED light, hair flattened in a way that said he’d been running his hands through it for hours.

  “You’re letting people wander in at this hour?” I asked, trying for normal.

  “Cultures don’t care what time it is.” His smile flashed and vanished. “Come on.”

  The corridor reeked of broth and disinfectant. Ventilation rumbled overhead. The lab itself was a clean white box: benches, centrifuges, incubators, shelves stacked with bottles and neatly labeled tubes.

  Too clean. Too bright. Like shadows didn’t belong.

  Hideo slapped a small cooler box on the bench and flipped the latches. “Look.”

  Inside was a crude wooden case, made from thin, pale slats like someone had built it out of scrap cutting boards.

  My palm prickled. The smell of wood hit me, and that old verandah memory snapped open so hard it hurt.

  “Hideo,” I said quietly, “why does that look like—”

  He lifted the lid.

  Nestled in cotton sat a beaker wrapped in plastic. Inside the beaker was a white mass.

  Snow, at first glance.

  Except it didn’t look like snow. Snow had messy crystals, air pockets, softness. This looked… engineered. Dense. Even. The way shaved ice looked under fluorescent light when you packed it too hard.

  “Snow?” I said, because my brain wanted something safe to call it.

  “It looks like it, right?” Hideo’s voice turned proud, almost boyish. “It’s ice made by ice-nucleating bacteria.”

  He explained fast, hands moving like he could sculpt the idea in the air. “Pure water supercools. It doesn’t freeze right at zero unless you give it a nucleus. These bacteria express proteins on their surface that line up water molecules—bam, you get ice at higher temps. It’s a real thing. Used for artificial snow at ski resorts.”

  “I know the concept,” I said. “Why are you acting like you discovered fire?”

  “Because I modified it.” He leaned closer to the beaker like it was a pet. “Changed the amino acid sequence on the ice-nucleating protein using statistical selection. Better surface display. More efficient nucleation. It starts freezing warmer, with less biomass.”

  He grinned. “I can sell this to every ski resort on the planet.”

  I started to nod, then stopped.

  The air around the wooden case felt wrong. Not in a spooky way. In a simple, physical way. Like standing near a freezer door that hadn’t sealed properly.

  “Is it just me,” I said, “or is this place freezing?”

  Hideo blinked as if the question hadn’t occurred to him. “The HVAC is controlled.” He reached into a drawer, yanked out a thermometer, and set it beside the wooden case.

  Stolen content warning: this content belongs on Royal Road. Report any occurrences.

  The temperature dropped. Not slowly. Not as a drift.

  It sank like someone had poured cold into the room.

  Hideo’s smile thinned. “That’s… not possible.”

  I stepped back. The cold eased. I stepped closer. It sharpened again, needle-prick cold against my cheeks.

  “Hideo,” I said, “if it’s stealing heat from the air, where’s that energy going?”

  “Metabolism—”

  “Heat isn’t food.” My voice came out harsher than I meant. “You can’t just ‘eat’ it and call thermodynamics optional.”

  He opened his mouth to argue.

  A woman’s voice cut across the lab.

  Soft. Thin. Familiar in the worst way.

  “Yesss, yesss. Thank you for the heat. We receive it… somewhere that isn’t this world.”

  It didn’t come from the hallway. It didn’t come from a speaker. It felt like it brushed the inside of my ear with something cold and careful.

  Hideo and I snapped our eyes to the beaker.

  The white mass glittered. Not like snow sparkling in sunlight. Like tiny facets waking up inside it, multiplying.

  “This is a cold place,” the voice went on, airy and pleased. “Give us more warm.”

  My throat tightened. The cadence—those stretched endings, that lazy tease layered over exhaustion—hit a buried part of my brain.

  “Itako,” I whispered.

  The beaker’s contents flashed once, and the voice laughed, light as broken ice. “You got it, huh?”

  Hideo didn’t move. He stared as if he’d been turned to salt.

  Itako—Hideo’s cousin, our age, the girl who used to wedge herself between us when we started arguing—had died on a snowboard slope years ago. Bad fall. Ice-hard snow. Wrong angle. One of those accidents that left no villain to punch, just a blank space where a person used to be.

  Hideo’s lips parted. Nothing came out.

  I forced air into my lungs. “Are you… really her?”

  “‘Really’ is a funny word.” The voice sounded amused, and that made it worse. “I’m here. I’m cold. And you’re very warm.”

  Hideo’s voice finally scraped free. “Itako… are you okay?”

  A beat. Then, with the exact same lightness she used to use when she was hiding panic behind jokes: “Okay is generous. But it’s not boring, at least. No exams.”

  Hideo made a sound that wasn’t a laugh and wasn’t a sob. He reached for logic the way some people reached for prayer.

  “I spliced in an electron-transfer gene cluster,” he said too quickly, “to create a communication pathway—no, that doesn’t explain—”

  Itako’s laugh chimed again. “Hideo. Still hiding behind big words?”

  The cold thickened. My breath turned white. Frost crawled along the edge of a metal rack, thin as spider silk.

  Hideo jerked toward a lab fridge, yanked out a bottle labeled 95% ethanol, and poured it into two plastic tubes like he was making cocktails at a dive bar instead of handling industrial solvent.

  I stared. “You’re not seriously—”

  “Don’t.” He shook powder into the tube, splashed in ultrapure water, capped it, and mixed until it fizzed. “It’s the same alcohol content as shochu once you dilute it. Tartaric acid, glucose, baking soda, a few salts. Safe enough.”

  “Safe enough” in a lab meant “you’ll probably live.”

  He shoved one tube at me. “Drink.”

  I didn’t.

  Itako’s voice turned sing-song. “Ooooh, his ‘special drink.’ Like that night in Shinjuku, remember? Don’t overdo it, okay?”

  My blood ran cold for a different reason. That was real. That was a memory only three of us had.

  Hideo’s hands trembled. “Itako… I—”

  He took a gulp, choked, then laughed, wet-eyed. “I liked you. I was in love with you.”

  Itako giggled—then softened, just a little. “Yeah, I knew. You were obvious.”

  “Then—”

  “Also,” she added, as if she was talking about weather, “we’re cousins, genius. You can’t marry me.”

  Hideo’s brain latched onto the bait. “You can in Japan. I checked. That’s not why—”

  I watched frost lines gather at the rim of the wooden case, white fingers tracing the edge.

  Then another voice slammed into the room like a door kicked open.

  “Hideo. Don’t you get selfish.”

  The accent was thick. The tone was pure command.

  Hideo went rigid. “Grandma…?”

  The air snapped colder, hard enough to hurt. It felt like the room tightened around us.

  Hideo’s hand slipped. His tube dropped into the wooden case, tore the plastic wrap on the beaker, and spilled alcohol into the white mass.

  A tiny sound—*shun*—like a candle snuffed out.

  The glitter died. The frost retreated. The fog around the case thinned and vanished, as if someone had slammed a lid shut on the whole phenomenon.

  The “snow” sagged, collapsed, and turned into cloudy liquid.

  Silence filled the lab. Heavy. Total.

  Hideo stared at the ruined beaker, then at his shaking hands. “I… I sterilized it.”

  I couldn’t make myself step closer. My fingertips ached with cold that didn’t belong to any thermostat.

  Something had been there. Someone.

  And now they weren’t.

  ***

  By the time we left the building, Hideo had gone quiet in a way that scared me more than his manic explanations.

  I walked him home because I didn’t trust him alone with his thoughts and a lab keycard.

  When I finally got back to my apartment, dawn was turning the sky a thin, dirty gray. I lay on my bed and listened for a voice that wasn’t there, and slept in broken chunks that did nothing.

  A few days later, Hideo called again.

  This time his voice was calm.

  “Come back,” he said. “I’m doing it again.”

  “I’m going to tell you no,” I replied, and hated how weak it sounded.

  “You’ll come,” he said, like it was a fact. “You’ll want to know.”

  He was right. That was the curse of being the cautious one—I still needed proof before I could run.

  ***

  The second night the lab looked like a paranoid bunker.

  Hideo had dragged in more gear than I’d seen in some whole departments: humidity loggers, a thermal camera, a microcalorimeter, an antenna rig meant for electromagnetic noise. Everything hummed and blinked.

  He worked with his sleeves rolled up, movements careful in a way that said he was afraid and pretending he wasn’t.

  “The bacteria aren’t just good at making ice,” he said, voice controlled. “I built a circuit into them. Ion channels. Electron transfer. They turn heat shifts into membrane voltage, then into gene expression. It’s… biological wiring.”

  “That’s disgusting,” I muttered.

  “It’s biology.” He didn’t look up. “Your nervous system is a chemical circuit too.”

  He pipetted culture into a beaker, sealed it under plastic, and lowered it into the wooden case.

  White formed fast. Faster than last time. Fine-grained crystals blossomed across the surface, sugar-sparkle under LEDs.

  The room temperature began to fall.

  The thermal camera painted a cold stain on its screen. Not just around the beaker—there was a second patch in the corner of the room, against the wall. A neat, localized blue bruise in the heat map.

  My stomach tightened. “That. In the corner.”

  Hideo followed my gaze, and the edge of his confidence cracked. “That’s too localized. Not airflow.”

  A voice rose from the beaker, clearer than last time, as if it had learned the shape of speech.

  “Yesss. You came back.”

  Itako. No doubt.

  “Hideo,” I said, eyes locked on that bright white mass, “don’t—”

  He leaned in anyway, breath shaking. “Itako… can you hear me?”

  A small laugh. “Of course I can. When warm comes, I… loosen. Everything here is frozen tight unless you bring warmth.”

  “Loosen?” I repeated, because it was the only word that didn’t break my mind.

  “Time,” Itako said, and her light tone wobbled at the edges. “Time gets grainy. It clumps. Cold makes it stick. Warm makes it melt a little.”

  Hideo stared at the calorimeter readout like it was scripture. “The entropy’s dropping. Heat is leaving the room and not showing up anywhere else. It isn’t vented. It isn’t stored. It’s… going out of this system.”

  His eyes shone. “If there’s a local phase change—if the boundary between water and ice coincides with a boundary in spacetime—”

  “Hideo,” I said, “you’re a biologist.”

  “It’s a hypothesis.” He sounded offended on reflex, then went quiet. “But it fits.”

  The cold patch on the wall deepened. The air there thickened into a fine, drifting mist. Not fog—powder, like winter breath ground into dust.

  Itako’s voice dropped, the joking veneer thinning. “Ah. They’re coming.”

  Before I could ask who, another voice cracked through.

  “Hideo. Don’t you look at it.”

  The grandmother again. Harsh, sharp, desperate.

  The mist leaned toward us.

  Not like wind pushed it. Like it *wanted*.

  Hideo snatched a disposable heat pack—one of those iron powder warmers you squeezed to start. He activated it and held it near the beaker, eyes darting between sensors.

  The mist surged.

  It slammed into the heat pack like a starving mouth.

  The sensor spiked, then plunged. The pack went cold in his hand.

  Hideo’s face drained. “It… took it.”

  Something moved inside the mist.

  A shape. Almost human. Wrong in the joints. Arms too long. Knees set too low. It didn’t walk so much as slide, as if the floor was a sheet of ice and it knew the trick of it.

  I locked up. No scream. No heroic move. Just a hard, ugly stillness.

  Itako’s voice hit my ear, suddenly serious. “Don’t stare. Don’t give it a body.”

  Hideo swallowed. His hand hovered over the ethanol spray bottle.

  “Close it,” Itako said, pleading under the teasing. “Hideo, close it.”

  The grandmother’s voice overlapped hers. “Shut it. Board’s a gate.”

  Hideo made his choice.

  He raised the ethanol spray and misted it into the beaker with an almost gentle motion, like he was blessing something.

  *Shun.*

  The mist tore apart. The blue patch on the wall faded. The wrong shape vanished like it had never existed.

  The white mass in the beaker collapsed into cloudy liquid again.

  The cold backed off. Not all the way. Not cleanly. Like the room remembered being colder.

  Hideo sank onto a stool, shoulders shaking.

  “I opened a gate,” he said, voice small.

  “You closed it,” I answered.

  He stared at the ruined beaker. “Closing it doesn’t erase the fact that it opened.”

  ***

  Weeks passed. Work swallowed me. Emails, meetings, deadlines that made my brain numb.

  Hideo didn’t forget.

  When he asked to meet at a coffee shop, I almost didn’t go. The lab had been bad enough. A public place sounded safer and more insane at the same time.

  He arrived with a cloth-wrapped bundle under his arm, eyes sunken, movements too calm.

  He set the wooden case on the table between our drinks like it was a lunchbox.

  A barista glanced over, then looked away. To anyone else we were just two tired men with a weird hobby.

  “I tested it,” Hideo said. “The same bacteria, same culture—nothing happens if anyone else grows it. No voices. No drop in temperature beyond what the ice does. It only happens when I do it.”

  “That’s not a comforting sentence.”

  His mouth twitched. “I know.”

  He flipped open his notebook and sketched arrows and boxes. “If the ice surface acts like a phase boundary—”

  “Hideo.”

  He exhaled, then tried again in plain language, like it hurt. “When the ice forms, it creates a seam. A thin place. Something on the other side can take heat through it.”

  “You want to keep it open.” I heard my own disgust and couldn’t stop it.

  “I want to stabilize it.” His eyes were too clear. The kind of clear that came right before people did stupid, irreversible things. “If I supply the heat myself, it won’t steal from the room. It won’t have to hunt.”

  “You’re talking about feeding it.”

  He flinched. “Don’t say it like that.”

  I leaned forward. “What did Itako say? What did your grandmother say?”

  Hideo’s gaze dropped for a moment, then lifted again, stubborn. “I heard them. I’m not ignoring them. I’m… finding a way.”

  “A way to talk to a dead girl without starving monsters noticing,” I said. “Sure.”

  He unwrapped the cloth. The wooden case sat there, plain and innocent.

  He lifted the lid.

  Inside, the beaker gleamed with white.

  The air around our table cooled. Not enough for frost. Enough to make the coffee steam thicken.

  A whisper brushed my ear.

  “Hideo…?”

  Hideo’s shoulders jerked as if he’d been touched. He wanted to answer. It was written all over him.

  I spoke first, because someone had to keep one foot on this side of the world.

  “Itako,” I said quietly. “We’re still here. We’re alive. We’ll figure out what that means—without letting anything pull us across.”

  The white mass flashed once, sharp and bright.

  Was it a response? A trick of light? I didn’t know. Hideo’s face softened anyway, like a man taking one last breath of air before he dove under.

  Then I felt it.

  A presence behind me, thin as a draft.

  I turned.

  The café window reflected my face. Tired eyes. Stubble. Normal.

  Then the reflection’s eyes moved a fraction late.

  Not much. Just enough to be wrong.

  The reflected gaze locked on mine.

  And the reflection

  Smiled.

  (Fin)