In the bustling city of Chroma, everything was gray.

Not the dull gray of old concrete, but a shimmering, silvery gray that swallowed every hue. Decades ago, a mysterious event called the "Fade" had drained the world of color, leaving only whispers of what once was. But 14-year-old Leo hadn't given up. He'd seen flashes of color in his dreams - crimson sunsets, emerald leaves, golden laughter - and he was determined to find them again.

His classmates called him a fool. "Colors are just fairy tales," sneered Ravi, the mayor's son, flicking a gray pebble at Leo's head. "Focus on something real, like ration cards."

But Leo knew better. His grandmother's journals, hidden under the floorboards of their attic, spoke of a time before the Fade. She'd written about a place called the Prism Vault, where the last remnants of color were guarded. The clues were cryptic, but Leo had pieced together a map etched in the margins.

One night, he stuffed a backpack with stale bread, a canteen, and his grandmother's journals, then slipped into the alleyways. The map led him to the abandoned subway tunnels, where rusted trains crouched like skeletal beasts. His flashlight trembled in his grip as he navigated the labyrinth, until -

Clang.

A sound echoed ahead. Leo froze, heart pounding. A figure stepped into the beam of his light: a girl in a patched coat, her eyes sharp. "You're not a Patrol officer," she said, lowering her crowbar.

"Neither are you," Leo shot back.

Her name was Mira, a "tunnel rat" who scavenged the underground. When Leo mentioned the Prism Vault, she smirked. "That old myth? My crew's searched every inch of these tunnels. There's nothing here."

"Then why are you still looking?" Leo challenged, nodding at the satchel of tools on her back.

Mira hesitated. "?Fine. But if we die, I'm blaming you."

They crawled through collapsed tunnels and waded through flooded passages until they found it - a sealed metal door, its surface etched with faded symbols. Leo's hands shook as he deciphered his grandmother's code. "The key is not a key," the journal read.

Mira snorted. "Cryptic grandma."

Leo pressed his palm to the door. It hummed, then the symbols glowed - blue. Not gray, but blue, vivid and electric. The door slid open.

Inside, the vault was a cathedral of light. Beams of color spilled from towering crystal pillars - ruby red, sapphire blue, sunflower yellow. Leo's eyes stung with tears. Mira reached out, brushing a beam of green with her fingertips. "It's? warm," she whispered.

But in the center of the room sat a machine, its gears frozen. Leo's grandmother's final entry flashed in his mind: "The Fade wasn't an accident. Someone stole the colors. The Vault can restore them - but it needs a catalyst. Something bold. Something human."

Mira frowned. "What does that mean?"

Before Leo could answer, shouts erupted behind them. Patrol officers, armed with gray-tipped rifles, stormed the vault. "Hands up! All color artifacts are property of the city!"

Ravi's father, the mayor, stepped forward, his grin venomous. "Did you really think we'd let two kids undo decades of control? Color breeds chaos. Hope breeds rebellion."

Leo's chest burned. He glanced at Mira, who nodded. Together, they lunged for the machine. The mayor barked orders, but Leo slammed his hand onto the central panel. The journals had said the catalyst had to be "human."

What's more human than a memory?

He thought of his grandmother's laughter, the smell of her ink-stained hands, the stories she'd told of a world alive with color. The machine roared to life, light exploding in a kaleidoscope. The officers stumbled back, shielding their eyes as color rippled across their uniforms, their skin, the walls -

The Fade reversed.

By dawn, the news spread: Color had returned. Grass sprouted green in cracked sidewalks, graffiti bloomed on walls, and people stared in wonder at their own flushed, golden, cocoa-brown hands.

Leo and Mira stood on a rooftop, watching the sunrise - streaks of orange, pink, and purple bleeding across the sky.

"What now?" Mira asked.

Leo grinned. "Now we make sure no one steals it again."