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lucky sins

Summary:

The Yumekira K-pop AU nobody asked for but I couldn't get out of my head, so I had to write.

Chapter 1: sins and all

Notes:

(See the end of the chapter for notes.)

Chapter Text

Present Day: 10 Minutes to Debut

Location: Seoul – Backstage, Global Debut Showcase

 

The air in the holding room was thick with the scent of hairspray, expensive perfume, and the kind of ozone-heavy tension that only exists seconds before a lightning strike.

 

Kira stood in front of the full-length mirror, staring at a reflection that felt like a stranger. For nearly three years, this day had been a distant mountain peak she was clawing toward; now that she was standing on the summit, she could hardly breathe. 

 

She was debuting today. 

 

After this, there was no turning back. 

 

Her world was about to tilt on its axis, and she knew it. 

 

Not many people ever experienced a moment like this—the terrifying clarity of knowing that a single three-minute performance would change the trajectory of their life forever.

 

She was dressed in a stylized school uniform—a classic K-pop aesthetic, but with a sharp, aggressive twist. Their debut concept was a high-stakes poker game, a battle of wits and nerves. Her dark hair was pulled back into a ballet-tight ponytail, sleek and severe. She looked exactly like the "Ice Queen" the teasers had promised: untouchable, lethal, perfect.

 

The song required a "hard" choreography, the kind of powerful, synchronized movement usually reserved for boy groups, pitting the members against one another. Blue team versus Red team.

 

Suddenly, a familiar warmth bloomed against her lower back. A chin hooked over her shoulder, and the mirror was no longer reflecting a solitary statue. Yumeko was there, her eyes sparking with that signature, effortless light. She looked like the sun caught in the sharp lines of a designer blazer.

 

"Kira-chan," Yumeko whispered. She used that specific tone, the one reserved only for the quiet spaces between them. "Breathe. You’re the most prepared out of all of us."

 

Kira finally let out the breath she’d been holding since the 4:00 AM makeup call. She leaned back just a fraction, letting her weight rest against Yumeko’s steady frame. "The stage is bigger than the practice room," Kira murmured, her voice low and raspy.

 

Yumeko squeezed Kira’s waist, her thumbs tracing the fabric of the uniform. "Everything is bigger now. But we are still the same." Yumeko caught Kira's gaze in the glass and winked. "It’s just you and me now, against a bigger world."

 

"You look cute in red," Kira said, a small smirk playing on her lips as she winked back, making Yumeko giggle.

 

"And you own the color blue. We’re perfect for each other," Yumeko replied easily.

 

"We’re supposed to be enemies, remember?" Kira reminded her.

 

It was true for the cameras. In the choreography, Kira and Yumeko had a center breakdown where they circled each other like predators about to strike. They were the faces of their respective "teams."

 

"In like an enemies-to-lovers kind of way, right?" Yumeko asked with a devilish smile.

 

Kira rolled her eyes, though the tension in her shoulders was vanishing. "You read too many romance books, Jabami."

 

"And you act like every main character in my books, Timurov," Yumeko countered with another wink.

 

Just like that, the shaking stopped. Yumeko always had that power—the ability to make Kira forget the weight of the world. Kira couldn't help but get lost in the other girl’s orbit. 

 

Yumeko was born with a natural magnetism, a light that captured every lens and every heart in the room. It was why she was the center and the visual; she had the kind of charisma that made people fall in love in seconds. She was already the most popular trainee in the lineup, and they hadn't even stepped onto the stage yet.

 

Kira didn’t mind. How could she? She was a fan herself, even from inside the group. 

 

But she knew some of the other members felt the sting of it. The insecurities were natural. They had been raised in a hyper-competitive, cutthroat environment for years, and the reality hadn't quite sunk in for everyone yet: they didn't have to fight each other anymore.

 

They had made it. They were a group. Their lives were now intertwined forever.

 

Suddenly the heavy door of the holding room swung open, and a floor manager with a headset stepped in, holding up two fingers. "Two minutes! In-ear check, everyone. Positions in sixty!"

 

The room erupted into a final, frantic blur of activity. Stylists lunged forward for one last dusting of powder, and assistants ducked through the chaos to hand out water bottles with straws. Amidst the flurry, Kira’s eyes remained locked on the monitor mounted in the corner.

 

The screen flickered, a high-definition VHS filter giving the footage a gritty, cinematic texture. A heavy, distorted bassline pulsed through the walls, vibrating in Kira’s chest.

 

"Look," Yumeko whispered, her shoulder brushing Kira’s as she nudged her arm. "It’s starting."

 

The screen cut to black before exploding with sharp, chrome lettering: THE HIGH STAKES.

 

The Strategist: Riri appeared first, bathed in a soft yellow glow. She sat at a card table, looking down at her hand with a quiet, focused intensity that felt like a warning. In the corner of the frame, a yellow cat hissed playfully.

 

The High Roller: Mary burst onto the screen next, regal in orange. She sported her signature hairstyle—already a viral fan favorite—and tossed a stack of chips into the air with the confidence of someone who owned the casino. A fox tail flickered behind her.

 

The Dealer: Jennifer followed, looking effortlessly sassy in pink. She shuffled a deck with lightning speed, her gaze smart and calculating. A tiny pink chick perched on her shoulder, a soft contrast to her fierce, "call-your-bluff" stare.

 

The Wildcard: Sayaka appeared in a wash of ethereal white. She looked sweet and almost clumsy as she dropped a card, only for the camera to reveal it was an Ace hidden in plain sight.

 

The Ace of Hearts: Bora, the Maknae, owned the screen in vibrant purple. She was pure energy, rapping a fast-paced verse directly into the lens while a digital butterfly danced around her. She was the spark plug, the life of the party.

 

Then, the music shifted—dropping into a deep, rhythmic throb.

 

The King of Diamonds: Kira stood in a column of ice-blue light. She didn't smile; she didn't even move. she simply stared into the soul of the camera, her discipline radiating off her like heat. She looked matured, mysterious, and in total control. The silhouette of a fish glided through the digital water behind her.

 

The Queen of Hearts: Yumeko finished the sequence in a flash of red. She blew a kiss to the camera, her flirtatious nature grounded by the bunny ears she formed with her fingers.

 

The VCR ended with all seven girls in a line: the Red Team (Yumeko, Bora, Mary) facing off against the Blue Team (Kira, Riri, Jennifer, Sayaka).

 

Under the roar of the backstage prep, Kira felt Yumeko’s hand find hers. They squeezed tight—a silent, private communication. We did it. They looked at their on-screen personas—the perfect, polished idols—and shared a small smile. Only they knew how much bluffing it had taken to get here.

 

Kira’s mind slipped, caught in the gravity of the past. The silver silk and the screaming fans faded, replaced by the scent of cheap floor wax and the humid, heavy heat of a California summer.

 

Three Years Earlier: The First Meeting

Location: Los Angeles – Global Trainee Housing

 

The "Global Group" project had started as a chaotic experiment. Forty girls from forty different backgrounds shoved into a dormitory in East LA, all competing for the chance of occupying one of the seven spots.

 

Kira sat on her assigned bunk, her suitcase already unpacked and organized with military precision. Her dance shoes were lined up by heel height; her practice clothes were folded into perfect, sharp-edged squares. 

 

To Kira, discipline was a shield.

 

If she was the most prepared, she couldn't be hurt. If she was the most focused, she wouldn't have to feel the crushing weight of her father’s disappointment.

 

He hadn't wanted her here.

 

He didn't understand her love for music; to him, dance and song were merely disciplines to be mastered for power, respect, and superiority—not passions to be felt.

 

But Kira loved music more than anything. 

 

Since she was a little girl, the only true comfort she’d known was the weight of a guitar in her lap and the scratch of a pen against a lyric notebook. 

 

Debuting in a girl group hadn't been her original plan, but when the opportunity called her name, it felt like destiny. The scouts had been impressed immediately—her vocals were soaring, her ballet background gave her an elite edge, and her fluent English made her an "ace" candidate.

 

Suddenly, the door to the room kicked open—literally.

 

A girl stumbled in, lugging two oversized suitcases that looked ready to burst at the seams. A stuffed animal’s leg poked out of one zipper, and a bag of Japanese snacks was precariously balanced on top.

 

The girl gasped something breathless in Japanese, letting the bags collapse to the floor with a loud, echoed thud.

 

Kira didn't move. She watched from her bed, arms crossed and expression flat. The newcomer straightened up, huffing a stray lock of dark hair out of her face. She looked like a whirlwind had just deposited her there. Her hoodie had a faint iced-coffee stain, and she was wearing two different colored socks.

 

The girl noticed Kira, and her eyes doubled in size. "Oh! Hello!" she chirped in English, her accent thick and bright. "I am... Yumeko! Nice to... meeting!"

 

Kira looked at the offered hand, then at the messy pile of luggage barricading the walkway. "Kira," she replied shortly. "Your bags. They are in the way."

 

Yumeko blinked, tilting her head like a curious puppy. She didn't seem to grasp the words, but she caught the frost in the tone. Most people would have recoiled. Yumeko just beamed wider.

 

"Kira! Like... 'Kirakira'?" Yumeko mimicked a sparkling motion with her fingers. "Sparkle-chan?"

 

"No," Kira said, her voice dropping an octave into a warning. "Just Kira."

 

Yumeko laughed—a loud, uninhibited sound that seemed to vibrate through the small, sterile room. She flopped down on the unmade bed opposite Kira, her legs swinging. "Just Kira." She paused, studying her roommate. "You... very..." She searched for the word, mimicking Kira’s stiff, regal posture. "...Elegant? Like... Princess?"

 

Kira felt a flush of irritation—or perhaps embarrassment—creep up her neck. She stood abruptly, grabbing her dance bag. "I am going to the studio. Do not touch my things."

 

As Kira marched toward the door, she heard Yumeko call out behind her. "Wait! Studio? I come too! We... dance-u?"

 

Kira didn't wait. She hurried down the hallway, her heart drumming a steady, disciplined beat. She didn't need a roommate, especially not one so messy and loud.

 

She didn't know yet that the girl with the mismatched socks would be the only person who could ever make her feel like home.

 

 

Present time

 

Kira’s grip on Yumeko’s hand tightened, pulling her back from the memory of that humid LA dormitory and into the electric, ozone-heavy reality of the now.

 

The floor manager began the final countdown, his voice cutting through the localized chaos of the wings. "Ten seconds! Standby for the pre-recording!"

 

The seven girls moved as one, a synchronized unit forged through three years of blood, sweat, and secret tears. They stepped out of the shadows and onto the black-glossed stage. Unlike a stadium, the space was intimate but intense—surrounded by flashing LED screens, massive camera cranes that swung like predators, and a few hundred fans packed into the pit. These were the ones who had followed every teaser, every "leak," and every rumor.

 

Kira took her place at the head of the formation, her "King of Diamonds" persona snapping into place. Beside her, Yumeko’s playful energy sharpened into the lethal, magnetic charisma of the "Queen of Hearts."

 

Then, the fan chants began—coordinated, loud, and echoing through the studio. They were shouting the members' names, a rhythmic roar that made the floorboards vibrate.

 

"KIRA! YUMEKO! RIRI! MARY! SAYAKA! BORA! JENNIFER! L-SINS!"

 

The screen behind them exploded into a kaleidoscope of red and blue light, flickering with the neon glow of a high-stakes casino.

 

The heavy, metallic bass notes of their debut single, "ALL-IN," shook the air.

 

Kira caught Yumeko’s eye for one last split second before the red light on the main camera flickered on. In that moment, the "Ice Queen" vanished, replaced by a girl who finally knew where she belonged and the world finally got to see the hand they were holding.

 

Notes:

Hello my beautiful people!

I’m so excited for this new story!!!

I’ve been wanting to read something with this concept for a while now so I finally decided to take matters into my own hands lol. And what better ship to do that than Yumekira?