The summer humidity in Tokyo didn't just make you sweat; it wrapped around you like a wet wool blanket and squeezed until you couldn't breathe. It was a physical weight, pressing down on the concrete jungle, turning the air into a shimmering haze of exhaust fumes and misery.
Leo stepped out of the Engineering building at Teito University, blinking against the harsh glare of the midday sun. His shirt was already sticking to his back, a sensation he loathed. Around him, other students were laughing, arguing about where to get lunch in Shibuya, or complaining about the heat in that casual, socially acceptable way. Leo just kept his head down, adjusting the strap of his messenger bag, feeling the familiar knot of anxiety in his stomach.
Inside the bag, his thermodynamics midterm sat like a lead weight. He didn't need to wait for the grade. He knew he had botched the second law question. He could still see the equations swimming before his eyes—entropy, enthalpy, the chaotic dance of energy loss. It wasn't that he didn't understand the concepts—he understood them intuitively. He could look at an engine and feel where the heat was bleeding out, visualize the inefficiencies like red flares in his mind. But putting it into the rigid, formalized proofs the professors wanted? That was where his brain short-circuited. He saw the world in mechanics, not mathematics.
He was a hands-on builder in a university that only cared about complex theories. While his professors and classmates loved debating abstract physics equations, Leo just wanted to build things that actually worked. He felt like a mechanic stuck in a room full of mathematicians.
He caught a train back to his aunt's house in the suburbs, squeezing into the crowded car between a salaryman dozing off, his head bobbing with the train's motion, and a student frantically studying for entrance exams with flashcards. The train rattled rhythmically over the tracks, the announcement chimes mixing with the low hum of conversation and the digitized beeps of mobile games. Leo stared at his reflection in the dark window as they passed through a tunnel—tired eyes, messy hair, and the look of someone who didn't quite fit.
When he finally got home, the house was empty. His aunt was at the market; his cousins were at cram school. Silence. Blessed silence.
Leo tossed his bag onto the tatami mats of his room and went straight to the backyard. He needed to work with his hands. He needed to make something real, something that followed rules he could touch.
At the edge of the property, half-swallowed by overgrown hydrangea bushes that buzzed with cicadas, stood his grandfather's shed. It was a leaning structure of weathered wood and corrugated tin, a relic from a time when people fixed things instead of throwing them away. To his aunt, it was an eyesore in their modern neighborhood, a blight on property values. To Leo, it was the only place in the world that made sense.
He slid the warped wooden door open. The air inside was stifling, smelling of rust, old oil, and sawdust. It was perfect. It smelled like potential.
Leo navigated through the maze of junk. There were half-disassembled fans, a washing machine motor he was planning to repurpose for a lathe, crates of rusty bolts, and the skeletal remains of a bicycle. He needed a specific size of copper tubing for a Stirling engine he was trying to build from scratch—a project that had absolutely nothing to do with his coursework and everything to do with keeping his sanity.
"Come on," he muttered, shifting a heavy stack of plywood that had been leaning against the back wall for as long as he could remember. "I know you're back here."
He grunted, heaving the wood aside. It crashed against a workbench, dust motes dancing in the sudden disturbance, revealing the back corner of the shed for the first time in years.
Leo froze.
He blinked, sure that the heat was finally getting to him. He rubbed his eyes, hard, until stars exploded behind his eyelids, and looked again.
There, hovering about three feet off the dirt floor, was a… ripple.
It looked like the air above hot asphalt, distorting the view of the wall behind it. But it wasn't hot. If anything, the air around it felt strangely cool, like the draft from an open freezer. It was a tear-shaped distortion, roughly the height of a door, shimmering with a faint, iridescent oil-slick sheen that seemed to catch colors that shouldn't exist in a dusty shed.
Leo slowly lowered the piece of copper pipe he was holding. The silence in the shed suddenly felt heavy, charged with static. The cicadas outside seemed miles away.
"Okay," he whispered, his voice sounding too loud in the cramped space. "That's not normal."
He took a step closer. The distortion didn't move. It didn't react. It just hung there, defying every law of physics he had just failed to write down on his exam. It was an impossibility, a hole in the world.
He reached out a hand, fingers trembling slightly, but stopped inches from the surface. He could feel a breeze coming from it. A cold, crisp breeze that smelled of… pine? And something metallic, like ozone before a thunderstorm. It was the smell of high altitude and clean air.
He looked around for something to test it with. He grabbed a long, rusted screwdriver from the bench. Holding it by the very tip of the handle, like a fencer with a foil, he poked the metal shaft into the shimmer.
The tip vanished.
There was no resistance. It was like dipping a stick into water, but the surface didn't ripple. The screwdriver just ceased to exist past the threshold.
Leo pulled it back. The metal was intact, but it was freezing cold to the touch. Condensation instantly formed on the steel, droplets running down the rust.
"Thermodynamics," Leo breathed, a manic grin tugging at the corner of his mouth. "Explain that."
He tossed the screwdriver onto the bench and grabbed his backpack. He didn't know what this was. A wormhole? A hallucination? A tear in the fabric of spacetime caused by the universe's sheer disappointment in his GPA?
He checked his phone. No signal. The distortion was interfering with the electronics; the screen flickered with static whenever he got too close.
He stood there for a long time, the sweat drying on his forehead. The logical part of his brain—the part that listened to his professors, the part that worried about student loans and career paths—was screaming at him to run. To call the police. To call a physicist. To board up the shed and never speak of this again.
But Leo wasn't a scientist. He was an engineer. And engineers didn't just observe phenomena; they interacted with them. They tested them. They built upon them.
He took a deep breath, filling his lungs with the musty air of the shed one last time. He adjusted his backpack straps.
"Well," he said to the empty room. "It's not like I have anything better to do."
He stepped forward. He closed his eyes. And he walked into the light.
The transition wasn't like walking through a door. It was a physical sensation, a sudden drop in pressure that popped his ears and twisted his stomach. For a split second, he felt weightless, suspended in a void of static and white noise, his body stretched and compressed all at once.
Then, gravity returned with a vengeance.
Leo stumbled, his foot catching on uneven ground. He pitched forward, bracing for the impact of the hard-packed dirt floor of the shed.
Instead, his hands sank into something soft and cool.
He gasped, scrambling to his knees, his heart hammering against his ribs like a trapped bird. The air was different. The heavy, humid blanket of the Tokyo summer was gone, replaced by a thin, sharp chill that bit at his exposed skin.
Leo opened his eyes.
He wasn't in the shed. He wasn't in Japan.
He was kneeling on a grassy hillside, surrounded by wildflowers that glowed with a faint, bioluminescent pulse in the twilight. The sky above him wasn't the harsh blue of noon; it was a deep, bruising purple, streaked with veins of orange and gold from a setting sun that looked slightly too large, too red.
Below him, a valley sprawled out like an illustration from a history book. Stone walls, ancient and moss-covered, encircled a town of slate roofs and cobblestone streets. Smoke curled from chimneys, smelling of wood fires and roasting meat—a primal, comforting scent.
And there, in the distance, gliding between the peaks of the misty mountains, was a shape that made Leo's blood run cold.
It had wings. Massive, leathery wings that spanned forty feet. It banked against the wind, a silhouette against the dying light, and a stream of fire trailed from its maw like a banner of destruction.
Leo sat back on his heels, his breath coming in short, ragged gasps. He reached down and gripped the grass, needing to feel the earth, needing to know this was real. The dirt felt gritty and cold under his fingernails.
"Toto," he whispered, his voice trembling, a nervous laugh bubbling up in his chest. "I don't think we're in Tokyo anymore."
He had found a new world. He would later learn its name: Astra.