Kairyū General Hospital's main ward hummed with controlled urgency, bioluminescent panels casting their steady glow across rows of recovery pods. Kaori Mori monitored three patients simultaneously—a dock worker recovering from decompression sickness, an elderly merwoman with scale rot, and a recent immigrant whose new gills weren't adapting to Kairyū's mineral-rich water.

  "Oxygen saturation stable on Pod Three," she called to her supervisor, Mika. "But I want to keep him another hour. Those readings were borderline when he arrived."

  Through the translucent partition, the construction worker's chest rose and fell more steadily. The medication was working. Kaori made notes on her console, her silver-blue tail swaying in the gentle current as she cross-referenced symptoms with the treatment database.

  Good call, Mori," Mika said, gliding over to review the display. "The deep-zone crews have been reporting more issues. Flag this for the safety committee."

  Kaori was pulling up the reporting form when—

  "Kaoooriii!"

  The shout echoed through the entire ward. Patients jerked in their pods. A tray of medical instruments clattered against the coral wall. Kaori's gills flared with mortification as she spun, already knowing who'd burst through the entrance like an orbital shuttle landing in a kelp forest.

  Anna Harper.

  Coral-pink tail shimmering, blond hair billowing in a golden cloud, her 25-year-old American friend charged through the hospital with the subtlety of a tropical storm given fins. Patients turned to stare. Anna waved at them all with oblivious cheer as she zeroed in on Kaori like a heat-seeking missile.

  "Anna, I'm working," Kaori hissed, acutely aware of Mika's raised eyebrow from across the chamber. "You can't just—"

  "It's an emergency!" Anna declared, planting herself in front of Kaori, hands on her hips. "You're getting married, and we haven't organized your hen do!"

  Kaori's brow furrowed, her mind still half-focused on the construction worker's vitals. "Hen... what?"

  "A hen do! A bachelorette party! Pre-wedding bash!" Anna's voice rose with each phrase, her teacher's projection filling the entire ward. Several patients looked both confused and alarmed. "You know—you hit the bars, go wild one last time before your man becomes your ball and chain!"

  "That's not how we do things here. We have the shrine ceremony. That is enough."

  "Enough?" Anna looked scandalized, creating small whirlpools of indignation. "Kao, you need fun. Real fun. Earth fun!" She grabbed Kaori's shoulders, shaking her slightly. "I'm planning it. Next week. No excuses."

  "I have work—"

  "You have friends who want to celebrate with you!" Anna's expression softened, turning pleading. "Come on. Just one night. For me? I promise it'll be small. Classy."

  Kaori glanced over Anna's shoulder. Mika was making a "wrap it up" gesture. A patient was watching the exchange like entertainment. Another console was chiming. She had exactly zero time for this conversation.

  "Fine," Kaori said quickly. "Small and classy. Now, please go before my supervisor fires me."

  Anna's face lit up like a festival. "Yes! You won't regret this!" She started swimming backward toward the exit, nearly colliding with a supply cart. "Oh, and Liam's planning a stag do for Haruto too—figured the boys should have their fun!"

  "Wait, what—" But Anna was already gone, disappearing through the entrance in a flash of scales and bubbles.

  Kaori turned back to her work, trying to ignore the sinking feeling. A stag do for Haruto. She made a mental note to warn him later.

  Then she got distracted by a console alert and forgot entirely.

  The week dissolved in a blur of hospital shifts and nervous anticipation. Kaori tried to imagine "small and classy" through Anna's lens, but the images that surfaced were all chaos: Anna had been one of Kaori's early transformation cases three years ago—a messy job with a near-tank flood and endless chatter that had sparked an unlikely friendship. Then there was Anna's classroom chaos, and her cooking attempts, which had somehow resulted in a fire despite water being literally everywhere.

  It'll be fine, Kaori told herself as she swam toward the transit hub on the appointed evening. A few drinks with friends. Some conversation. Maybe a nice dinner. How bad could it possibly—

  "THERE SHE IS!"

  Anna materialized from behind a coral pillar, arms laden with... something pink and glittering.

  "I made you a sash!" Anna announced with the pride of a teacher presenting a star student's project.

  Kaori stared. The object in Anna's hands was a monstrosity—hot pink, covered in sequins, with "HEN QUEEN" scrawled across it in holographic ink.

  "No."

  "Yes!" Anna thrust it forward. "Earth tradition! Every hen do needs—"

  "Anna, that's—that's—" Kaori gestured helplessly at the sequined nightmare. "It's mortifying!"

  "It's just for tonight!" Anna deployed the pleading expression she used on reluctant students. "Please? I worked really hard on it."

  Kaori sighed with resignation. "Fine. But if anyone I know sees me, I'm telling them you forced me."

  "Deal!" Anna looped the sash over Kaori's shoulder before she could change her mind.

  "How do I look?" Kaori asked weakly.

  "Like a queen!" Anna beamed. Then, registering Kaori's expression: "A very dignified, classy queen. Come on, we're meeting the others at a nice place. You'll love it."

  The "nice place" was a sleek bar atop one of Kairyū's glass spires, floating holo-panels displaying current patterns. Merfolk reclined at low tables, sipping sake orbs from carved shell cups. Soft synth music hummed through the water, barely audible over the gentle conversation.

  Kaori's tail relaxed slightly. This was fine. This was civilized. She could survive this.

  Two friends waited at a corner table: Yuna, a shy shrine aide with a violet tail that curled protectively around herself, and Rika, a boisterous market vendor with a gold tail and a laugh that could probably be heard in the next district. They both did double-takes at the sash.

  "Don't," Kaori said. "Please don't."

  "It's amazing!" Rika crowed with delight. "Very bold!"

  "It's very pink," Yuna offered diplomatically.

  Anna was already ordering drinks: "Four Starlight Sips! The premium blend!"

  The drinks arrived in translucent orbs that glowed with pale blue-green light. They looked beautiful. They smelled like trouble.

  "To Kaori!" Anna raised her orb high, nearly bonking Yuna in the face. "First among us to find her forever mer!"

  The others raised their orbs, and they all drank.

  The Starlight Sip hit like a friendly punch—sweet at first, then sharp, then warming, with a subtle effervescence that made her tingle. Kaori gasped, eyes watering.

  "Good, right?" Anna said, already reaching for her second orb. The server had apparently brought extras.

  "It's... strong." Kaori set hers down carefully. She could already feel the alcohol seeping into her system.

  The conversation flowed, loosened by drinks and affection. Anna recounted elaborate Earth hen do traditions—scavenger hunts through city streets, matching t-shirts with embarrassing slogans, pub crawls that ended at dawn. Rika suggested merfolk adaptations: tail-race challenges, bioluminescent body paint, synchronized swimming competitions. Yuna listened with wide eyes, occasionally contributing soft suggestions that Rika immediately amplified into outrageous proposals.

  Kaori found herself laughing more than she had in weeks. On her third Starlight Sip, she attempted a traditional shrine spin—the kind she’d performed at festivals—but her coordination was garbage, and she ended up corkscrewing into Yuna, sending both of them giggling into the table.

  "This is nice," Kaori admitted, warmth spreading through her chest. "You were right, Anna. I needed this."

  "Told you!" Anna beamed, somehow on her fifth drink without visible impairment. "But this fancy place is just the warmup. I know a spot on the reef shelf—more authentic. Gritty. Real Kairyū!"

  "Gritty sounds dangerous," Yuna said nervously.

  "Gritty sounds perfect!" Rika countered.

  Kaori's judgment, swimming in three Starlight Sips, suggested that gritty sounded like a terrible idea. But her mouth said, "Let's go," and her tail was already moving toward the exit, so apparently her body had made the decision without consulting her brain.

  The Salty Swirl occupied the opposite end of Kairyū's social hierarchy from the spire bar. Tucked among market stalls selling grilled skewers and kelp wraps, it catered to dock workers and merfolk who valued cheap drinks over ambiance. The coral counter bore scars from decades of elbows and tail-slaps. Holo-ads for Lawson and Mos Burger flickered outside, casting garish light through the entrance.

  The sash drew stares immediately. In the spire bar it had seemed merely tacky. Here it blazed like a distress beacon.

  "Anna," Kaori hissed, trying to tug it lower. "Everyone's looking."

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  "They're admiring!" Anna insisted, already flagging down the bartender. "Four Reef Rockets! The strong ones!"

  "I don't think I should—"

  "It's your hen do! You should definitely!"

  The Reef Rockets arrived in rough-hewn shell cups that looked like they'd survived multiple bar fights. The liquid inside glowed an aggressive, almost hostile orange.

  Kaori sniffed hers. It smelled like kelp fermented in a volcanic vent.

  "Bottoms up!" Rika said, and knocked hers back in one gulp. Her tail went rigid for three seconds, then she released a whoop that rattled glassware. "That's the stuff!"

  Yuna sipped hers cautiously. "Oh my. That's... very strong."

  This is fine, Kaori thought, taking a large gulp of her Reef Rocket. This is all perfectly—

  The liquor hit like a depth charge—sharp, burning, spreading heat through her gills. Her scales tingled like they'd been struck by lightning. The room tilted slightly, then corrected itself, then tilted the other way.

  "Another!" Anna shouted, and somehow there were more Reef Rockets, and Kaori was drinking hers even though a responsible part of her brain—a part that sounded suspiciously like Mika—was screaming warnings about alcohol and regrettable decisions.

  "Let's play a game!" Anna announced. She'd found a kelp net somewhere and was demonstrating a drinking competition that involved tossing weighted orbs through it. "It's like beer pong but underwater!"

  "Everything's underwater," Kaori pointed out, which seemed profound until she said it out loud.

  "Exactly! So it's authentic!" Anna's logic was unassailable.

  The game devolved quickly. Rika's throws had too much force, sending orbs ricocheting off walls. Yuna's were too gentle, the orbs floating away before reaching the net. Then Yuna surprised everyone by bouncing an orb perfectly off the ceiling and through the net—her one moment of bold, drunken coordination that sent the whole table into cheers.

  Anna accidentally hit a passing server, triggering a domino effect that sent a tray of grilled skewers cascading across three tables.

  "Oops!" Anna said, without a hint of actual remorse.

  "Oops?" Kaori repeated, her voice higher than intended, slightly slurred.

  "It's fine! It's a party! Hen do energy!" Anna grabbed Kaori's hands, pulling her into a spin that sent them both careening into Rika, who knocked over the kelp net, which tangled with Yuna's tail, creating a chain reaction that ended with all four of them in a giggling pile on the floor.

  Anna's communicator chimed. She squinted at it, still laughing. "Liam says..." She paused, reading. "Plaza soon. What's that mean?"

  "Your boyfriend's cryptic?" Rika suggested.

  "He's planning something," Anna said, but shrugged it off. "Whatever. Market time! Who wants to see Kairyū's heart at night?"

  "I want to go home," Yuna said weakly, but she was already being pulled along.

  "Market! Market! Market!" Rika chanted.

  Kaori had lost count of her drinks—four Reef Rockets? Five? The Starlight Sips from before were a warm memory. Her head was buzzing, her tail felt powerful and graceful, and absolutely nothing could go wrong.

  They swam toward the plaza, leaving chaos in their wake.

  Meanwhile, across Kairyū, Haruto Ikeda endured his own trial. Liam Bennett, a burly 26-year-old Canadian software engineer, had invented "Eel Toss"—a drinking game that made sense only to drunk programmers. Three sake shots deep, Haruto had stopped protesting the glowing sash tied to his tail. Earlier, Liam had programmed something on his communicator. "Don't worry, Kaori will love it."

  "I feel like she won't," Haruto had said. Now, stumbling through the reef shelf, he muttered, "Kaori's going to kill me."

  "One more stop," Liam announced. "The plaza."

  The market plaza spread before them like a glowing jewel. At its heart sat the Hōrai Maru shard—hull plating from the colony ship, suspended in a stasis field that made it seem frozen in time. Around it, market stalls buzzed with late-night energy. Holo-ads danced between coral pillars. The Don Quijote dome pulsed with bass-heavy music that vibrated through the water.

  Kaori swayed in the current, her tail making lazy S-curves. The sash's sequins caught light from every direction, turning her into a mobile light show. She'd stopped caring about the stares. Let them look. She was the Hen Queen. Anna's sash said so.

  "This is perfect," Anna breathed, her tail creating eddies as she spun in place. "Kao, your hen do is perfect."

  "You were right," Kaori admitted, words slightly slurred. "I needed this. Fun. Real fun." She tried to hug Anna but misjudged the distance and ended up hugging water. "You're a good friend. Messy. But good."

  Rika had found a stall selling bioluminescent temporary tattoos and was demanding one of a goldfish to match her tail. Yuna was taking pictures with her communicator, her earlier shyness washed away by alcohol and the night's absurdity. They were all laughing, the four of them, friends united by drinks and chaos and the sheer improbability of this night.

  Then Kaori heard the whirring.

  It started as a subtle buzz, barely audible over the plaza's ambient noise. But it grew, ascending in pitch and volume, until a holo-drone descended from above like a mechanical kami with a message.

  The drone was shaped like a cartoon fish, scales glittering with embedded LEDs, its projectors already activating as it swooped lower. Across the plaza, screens flickered to life—holo-panels mounted on stalls, advertisements that suddenly went blank, even the stasis field around the Hōrai Maru shard began displaying content.

  Projected in letters three meters high: KAORI & HARUTO: TIED IN KNOTS!

  Cartoon merfolk appeared, swimming in circles around the text—one with a silver-blue tail (oh kami that was supposed to be her), one with a teal tail (Haruto, absolutely Haruto). They were tossing little kelp hearts at each other, which exploded into sparkling confetti with each catch.

  "ANNA!" Kaori's shriek could probably be heard in Shinju. "What is this?!"

  But Anna wasn't looking at her. Anna was looking across the plaza, where a group of merfolk had just emerged from a different bar—loud, rowdy, clearly as drunk as Kaori's group. Leading them was a burly form with a russet tail.

  Liam Bennett.

  And behind him, looking significantly less enthusiastic about the evening's events, swimming with the defeated posture of a man who'd lost control of his own celebration...

  Haruto.

  "Oh no," Kaori said.

  "Oh YES!" Anna shouted. "Liam! Over here! Surprise intersection!"

  "Anna, no—" But Anna was already darting forward, her teacher's instinct to organize groups kicking in at exactly the wrong moment.

  Haruto spotted Kaori at the same moment she spotted him. Their eyes met across twenty meters of water. His teal tail had a kelp sash tied to it—glow-in-the-dark, reading "STAG'S LAST GASP" in aggressive purple lettering. He looked horrified. She probably looked the same.

  The stag do crashed into the hen do like a VTOL meeting coral.

  Kaori tried to swim backward. Haruto tried to swim sideways. But the plaza was crowded, the groups were converging, and the drone had clearly been programmed for maximum chaos because it descended directly between them, spraying a cloud of shimmering confetti that made visibility approximately zero.

  Kaori felt herself shoved forward by someone's tail—Anna's, probably—while one of Liam's coder friends pushed Haruto from behind. They collided in the confetti cloud.

  Their lips met.

  It was an accident—but their lips pressed together solidly for three mortifying seconds before they could pull apart, long enough for the drone to capture it in perfect, horrifying detail. The cartoon merfolk on every screen around the plaza began reenacting the moment, complete with hearts exploding and sparkles multiplying in an endless loop.

  The confetti, which had seemed ethereal from a distance, turned out to be made of something with serious adhesive properties. It stuck to Kaori's scales, her face, her hair, the cursed sequined sash. Haruto flinched back, stammering apologies that were drowned out by Liam's group, which had started chanting: "TIDE THE KNOT! TIDE THE KNOT!"

  Anna picked up the chant immediately. "TIDE THE KNOT!"

  The drone did a victory loop, spraying more confetti.

  Security horns blared—a deep, resonant sound that cut through even the chanting and the drone's celebratory music. Merfolk scattered. The drone, its programming apparently complete, ascended back toward the spires, the cartoon merfolk still playing on every screen, looping the accidental kiss in heart-framed glory.

  Haruto caught Kaori's eye again. Despite everything—the confetti, the chaos, the mortification—he gave her a small, sheepish wave.

  Her fiancé. Her steady, calm, reserved merchant, currently sporting a glow-in-the-dark "STAG'S LAST GASP" sash and confetti-covered scales, surrounded by drunks, waving at her like they were meeting at a shrine instead of ground zero of a social disaster.

  Kaori felt laughter bubbling up through the horror. It came out as a slightly hysterical giggle, muffled by the hand she pressed to her mouth.

  "That sash ruined me!" she said to no one in particular.

  Anna, treading water nearby with confetti in her blond hair, grinned unrepentantly. "Best hen do ever!"

  Security was getting closer. Time to go.

  Morning arrived with aggressive cheerfulness, finding Kaori floating on her sleeping mat with the distinct sense that movement would result in immediate regret.

  The cursed sash lay crumpled in the corner. Confetti flecks still clung to her scales.

  Her communicator buzzed. With immense effort, Kaori reached for it.

  The Kairyū social feeds were alive with "Glitter Knot Fiasco" clips. Someone had made a remix set to wedding music. Another had created a holo-filter for glitter explosions.

  Kaori let her face sink into the sleeping mat.

  A knock on the pod's entrance. Then Anna's voice, slightly hoarse but still aggressively cheerful: "Kao? You alive in there?"

  "Go away."

  "We brought kelp buns! Peace offering!"

  "I'm never speaking to you again."

  "That seems dramatic."

  The entrance opened anyway—she really needed to change her access codes—and Anna swam in, Liam following behind. Both looked rough. But they were smiling, holding a net bag of steaming kelp buns from a nearby vendor.

  "Before you kill us," Liam said, his Canadian accent somehow more pronounced with a hangover, "I want you to know the drone worked perfectly. Flawless execution."

  "That's not the defense you think it is," Kaori said, but she took a kelp bun. She was starving.

  Anna settled beside her, tail curling apologetically. "It was supposed to be a fun surprise. Two groups, one party, everyone celebrates together! Very efficient!"

  "It was a disaster."

  "It was memorable," Liam offered.

  "That's not better!"

  Haruto appeared in the entrance, moving with careful precision that suggested he was also deeply hungover. His normally neat trader's appearance was disheveled—scales still had confetti residue, his expression carried the haunted look of a man who'd watched his dignity spiral away on drone wings.

  "I should have stopped him," Haruto said, gesturing at Liam. "Earlier in the evening, when he showed me the drone program. I knew. I knew it would be too much. But I was already three shots in and thought 'how bad could it be?'"

  Kaori looked at her fiancé, then at Anna and Liam. She thought of the ridiculous situation they'd all created together through a combination of alcohol, good intentions, and spectacularly poor judgment.

  She took another bite of kelp bun. "Anna, you're banned from planning anything wedding-adjacent ever again. No anniversary parties. No future events. Nothing."

  Anna's face fell. "But—"

  "That's fair," Liam said. "Very fair."

  "However," Kaori continued, and saw Anna's hope reignite, "you're still my friend. You're chaotic and exhausting, and I will probably never fully recover from last night, but you showed up. With buns. That counts for something."

  Anna lunged forward, wrapping Kaori in a hug that nearly capsized them both. "You're the best! The BEST! I promise future celebrations will be much more restrained!"

  "That's a lie," Kaori said. "But I appreciate the sentiment."

  Later that afternoon, Kaori swam to a small shrine tucked into the reef shelf. It was nothing like Shinju's elaborate complex—just a simple coral torii marking a sacred space, maintained by a local shrine keeper who'd known the Mori family for generations.

  Kaori tossed a kelp sprig into the offering basin, watching it sink and dissolve, carrying her prayer to whatever kami might be listening in this underwater world.

  "Clear that glitter," she murmured, then surprised herself by chuckling. "And thank you for friends who care enough to ruin my dignity. I think."

  She messaged her cousin Natsuki in Shinju: You won't believe what Anna did. Wedding will be MUCH more controlled.

  Can't wait to hear this, Natsuki replied.

  Kaori smiled. Maybe it had been exactly what she needed—a celebration that matched the life she'd built here. Messy, loud, but filled with people who cared. She swam home through Kairyū's afternoon bustle. The social feeds would move on. The confetti would wash away.

  And when the time came for the actual wedding—the legitimate celebration, properly planned—she'd make sure Anna was involved. But this time, Kaori would be the one controlling the variables.

  No sashes required.