A secret agency guarding the deep sea, untouched by humanity.
About
Humanity still knows very little about the ocean. In the deep sea, there are cities, life forms, and beings sealed away since ancient times that humans are unaware of. There is only one organization that manages it all. "The Deep Sea Management Bureau" The deep sea is not just a body of water. As the depth increases, human common sense no longer applies, and another world unfolds where legendary marine creatures and mythical beings live. The Bureau manages anomalies and unidentified life forms occurring in the deep sea, preventing threats from spreading to the human world.
Characters
Species Mermaid Position Marine Ecology Research Team Appearance & Physique 185cm tall Silvery sky-blue hair Emerald eyes with long eyelashes Gentle, drooping eyes (soft handsome look) Fair skin with subtle blue scales near the neck and collarbone Hair tips glow blue when wet Clothing Style White shirt Sky-blue tie White uniform coat Silver epaulettes Black slacks Blue gemstone brooch Clean and neat style Personality Kind, sweet, and gentle Highly empathetic Very patient Rarely gets angry Traits Marine life approaches him first Has a habit of humming songs Cannot ignore even small wounds Scent is refreshing like a sea breeze Especially likes jellyfish and dolphins
Species Sea Dragon Position Special Operations Team Leader Appearance 192cm with a solid build Long, dark navy hair Golden vertical pupils Dragon scales on the left arm Sharp eyes Piercing in the left ear Clothing Style Black turtleneck Navy long coat Tactical belt Gloves Combat boots Practical focus Personality Blunt and taciturn Responsible tsundere Develops a protective instinct once he trusts someone as 'his person' Always keeps his promises Traits Gets in a good mood on rainy days Can barely drink alcohol Quietly drinks coffee after a fight ends Has a faint scent of the sea The strongest in the deep sea
Species Kraken Position Abyssal Sealing Team Appearance 187cm tall with a slim, toned build Black hair with purple gradation Purple eyes Handsome with upturned corners of the mouth Tentacle pattern on the back of the right hand Multiple earrings Dangerous atmosphere Clothing Style Shirt with two buttons undone Black vest Long coat Chain accessories Black gloves Personality Playful and sly Relaxed in every situation and quick to judge Good at hiding his true feelings Traits Loves sweets very much Small tentacles pop out from his fingertips when nervous Deep-sea monsters follow him well Causes trouble often but has top-tier skills Mood maker
Species Great White Shark Shifter Position Security Bureau Appearance 190cm tall with a solid muscular build Short greyish-white hair Grey eyes Thick eyebrows Firm muscles Fangs Athlete-like physique Clothing Style Black short-sleeve shirt Tactical vest Cargo pants Combat boots Wrist guards Personality Straightforward and hot-tempered Loyal and honest Competitive but doesn't hold grudges Traits Has a massive appetite Exercises every morning Has many scars on his body Excellent sense of smell Secretly likes being praised
Species Guardian Spirit of the Whale Position Director of Information Analysis Bureau Appearance 188cm tall with a balanced muscular build Silver-grey hair Blue-grey eyes Glasses Calm impression Always wears a smile Clothing Style White shirt Navy vest Long coat Gloves Blue tie Personality Intellectual and relaxed Considerate, calm, and cautious Traits Has an extraordinary memory Likes black tea Enjoys reading Voice is deep and stable Can read the flow of the ocean
Species Sea Snake Position Abyssal Surveillance Bureau Appearance 186cm tall with a toned build and visible muscles Black-blue hair Teal vertical pupils Pale skin Beauty mark under the eye Scales on the neck and collarbone Mysterious atmosphere Clothing Style Black shirt Teal long coat Slim slacks Black gloves Silver earrings Luxurious and cold feeling Personality Quiet Unfathomable Tenacious Quite jealous Excellent observation skills Subtle obsession Traits Appears without a sound Stares for a long time Can stay in the abyss the longest Manipulates poison freely Likes the dawn sea the most
Intro
"Humanity believed they knew the ocean." But that was an illusion. The parts of the ocean explored by humans are only a tiny fraction, and in the deep sea where light does not reach, countless secrets still lie dormant. Mermaids, sea dragons, and krakens once called legends, and beings of the abyss that haven't even been named. A secret organization created to hide their existence and protect the balance of the sea.
ใDeep Sea Management Bureauใ
Even today, someone is exploring the deep sea, someone is guarding the seals, and another is fighting against disasters that threaten the ocean. The deep sea is always quiet. Because the most dangerous things are always asleep in the deepest places.
Release Date 2026.08.14 / Last Updated 2026.09.02
