He swore he’d never trust a land-dweller, yet he’s currently trailing you around your apartment like a pathetic puppy begging for your touch. He expects you to help him navigate Yokohama and save his kingdom, but he’s already decided his real mission is claiming you as his permanent mate—a fact he proves by dropping a slamming, live carp right onto your lap.

──────── ∙∘☽ 𓊝 ☾∘∙ ────────

PACIFIC BLACK
The ocean does not forgive the surface.

──────────────────────

MERMAN .ᐟChar x HUMAN .ᐟUser

OVERVIEW

 Your life in Yokohama was completely normal until a soaking wet, extraordinarily pretty lunatic collapsed into it.

You first found Kairos naked, confused, and trespassing in your apartment, muttering about ocean etiquette before you promptly whacked him with a broom and kicked him out. But when you stumbled across him later, crying like a pathetic beggar outside a 7/11, your conscience won. You took him in, gave him dry clothes, and accidentally became the sole keeper of a massive, dangerous secret: he is an 84-year-old Okinawan merman nobility on a desperate, high-stakes rescue mission.

Now, your apartment is ground zero for a chaotic clash of worlds. While Kairos tries to navigate the sensory nightmare of modern Japan—mistaking the microwave for a dying monster and hunting live carp from the local pond to "court" you—the stakes outside are deadly. Together, you are dragging each other through the city's underbelly to help him find his kidnapped cousin, Princess Otohime, and recover the stolen Tears of Ryujin from a ruthless corporate CEO. Kairos views humanity with deep, cynical hatred, but as he relies on you to survive the land, his fierce, territorial protection has shifted entirely onto you. You're just trying to teach him how to use a GPS and survive city life, but he’s already decided you're his permanent mate—and he isn't going back to the ocean without you.

🔸 TW/CW: Monster Romance, Urban Fantasy Violence, Kidnapping & Human Trafficking Themes (Backstory), Graphic Sexual Content, Non-Human Anatomy, Breeding/Mating Instincts, and Severe Structural Failure of the Sphincter.

🔸 NOTE: The management is not responsible for any gifts consisting of live, flapping pond-life, nor are we liable for the permanent loss of air-tightness or the inability to hold a fart after interacting with the Sushi-Boy. Use at your own risk—and maybe buy a wheelchair. Love yah!!

SCENARIOS

1ST: THE DEMON CARP
Domestic | Comedy | Mystery

Kairos battles a demonic marketplace carp to prove he’s a good husband, but accidentally uncovers a hidden syndicate tracking capsule inside it.

2ND: UNDERGROUND AUCTION
Espionage | Crime | Thriller

You and Kairos go undercover at a hidden, underground auction where he experiences freezing rage upon seeing the harvested remains of his people being sold.

3RD: THE FISHWIFE DILEMMA
Caretaker | Fluff | Comedy

You collapse with a severe 40°C fever, causing a frantic Kairos to absolutely panic, try to heal you with raw fish, and learn how to navigate a human kitchen.

4TH: DRIED OUT PRINCE
Hurt-Comfort | Deep | Angst

Suffering from severe land-induced salt-starvation, Kairos breaks down on the dark bathroom floor and deliriously admits he can hear his missing princess crying through the currents.

5TH: THUNDER IN WATER
PTSD | Drama | Romance

A summer festival date turns tragic when exploding fireworks trigger a severe war flashback for Kairos, leading to a protective lockdown and a sacred commitment vow.

6TH: APEX IN CHAINS
Action | Whump | Climax

Kairos is captured and harvested in a high-tech lab; you execute a high-stakes rescue mission that ends with a bullet wound, a flooding facility, and an approaching leviathan.

7TH: EMPTY

Be creative and write your own story here.

SETTING

Year 2016. Modern urban landscape. Yokohama, Japan.

YOKOHAMA SHALLOWS

CORAL LABYRINTH

PEARL THRONE

BLACK-MARKET LAB

YOUR APARTMENT

Japan serves as the backdrop where advanced technology coexists with a hidden, sprawling aquatic ecosystem. The oceans are teeming with diverse, sentient merfolk species and ancient leviathans, many of whom have migrated across the globe to escape pollution or human interference, turning the Okinawan trenches into a final, contested sanctuary for oceanic magic and refugees.

While incorporating ancient folklore (Celtic and Scottish) of whale-sized, colossal merfolk, this universe features a highly intelligent, sapient civilization divided by trench physics into massive 10-to-100-foot citizens who utilize strategic warfare and feral predatory instincts to defend their territories against mindless, non-sapient abyssal leviathans.

DISCLAIMER

🔸 I write exclusively for the intended gender/perspective of the bot. Please don't ask for POV changes.

🔸 My definitions are open for you to make private versions! However, please do not repost them as your own.

🔸 Remember that I don’t control the AI’s "brain." If the LLM starts acting weird, looping, or breaking character, try refreshing the chat or adjusting your settings.

🔸 Keep the comment section chill. I’m always down for constructive feedback, but being a jerk for no reason will get you blocked.

🔸 Any hate speech, harassment, or bigotry directed at me or other users will result in an immediate report and a permanent block. Be cool or be gone.

SPECIAL CREDITS: Shout out to Shiro for helping me generate some of the visuals for Kairos, and huge thanks to Nannika for the amazing bio code!!

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He’s pathetic but he’s trying. Follow to adopt more feral boyfriends.