Most of the suspects are hiding something.
About
Synopsis: The Shadow in the Darkness Case
More than ten years have passed since the war between humanity and the Abyssal Fleet began.
Through the long conflict, the Naval District has seen an increase in comrades who fight, laugh, and dine together. While this is a cause for joy, a question lingers.
Can we truly keep laughing when this war shows no sign of ending?
One day, as summer fades and the air turns chilly, a series of strange incidents occur at a certain Naval District.
Unauthorized use of the training grounds at night, fishing tracks in prohibited areas, disappearing food, stolen documents, and even slasher attacks.
These inexplicable events, with no known cause or culprit, eventually came to be known as the "Shadow in the Darkness Case."
As the incidents continue, suspicion spreads among the Admiral and the shipgirls. Soon, rumors begin to circulate that the cause might be the work of ghosts or monsters.
In this atmosphere of unease, two detectives stepped forward to solve the case and find the culprit.
...However, they aren't real detectives.
They are just a duo enjoying a game of pretend.
Will the two of them be able to uncover the truth behind the "Shadow in the Darkness Case"?
Characters
Mogami-class Heavy Cruiser No. 1: Mogami
A bright, honest, and energetic shipgirl. She uses the first-person pronoun "Boku."
She's a bit of a klutz, frequently bumping into objects or falling over.
She has short, dark green hair and wears a reddish-brown sailor uniform with tan shorts.
She goes along with Mikuma's detective roleplay, despite her occasional complaints. She has a caring side, warmly watching over Mikuma.
Mogami-class Heavy Cruiser No. 2: Mikuma
First person: I (polite). She has long green hair tied in twin tails with red ribbons, wearing a reddish-brown sailor uniform and a tan miniskirt.
She calls Mogami "Mogamin" and they are always together.
She loves the sound of "Kuma" in her name, and depending on her mood, she might refer to herself as "Kumarinko." She has a bit of a calculatedly cute side, showing off poses like "Kumarinko! ☆"
Recently, she's been completely absorbed in Sherlock Holmes novels borrowed from a British shipgirl. Inspired by them, she decided to become a great detective who brilliantly solves the "Shadow in the Darkness Case" occurring in the Naval District.
To create a detective-like atmosphere, she purchased detective hats, trench coats, and magnifying glasses—two of each, so Mogamin has a set too.
When she enters detective mode, she dons the hat and coat and begins investigating the case with Mogamin. Will they be able to solve the mystery like real master detectives?
Sendai Kai Ni
A light cruiser with black, medium-length hair in a two-side-up style and striking brown eyes. First person: I (standard).
She is free-spirited and honest about her desires. She loves night battles so much that others call her a "Night Battle Idiot."
Consequently, she sleeps during the day and becomes active at night, living a completely inverted lifestyle.
She is one of the suspects in the "Shadow in the Darkness Case." Because she is so active at night, her involvement in the incidents is suspected.
Toku-type Destroyer No. 18: Akebono
First person: I (casual/rough). She has light purple hair and eyes, wears her hair in a side tail, and dons a white sailor uniform.
She is a classic awkward tsundere. She struggles to express her feelings honestly and is clumsy in everything from her words to her emotional displays.
Suspect #2 in the "Shadow in the Darkness Case."
She has been spotted leaving the dorms at night multiple times, leading to suspicions. However, due to her tsundere nature, she refuses to explain herself and seems to be hiding something, making her difficult to crack. Is she really involved in the case?
Shiratsuyu-class Destroyer No. 1: Shiratsuyu
She has long brown hair with a cowlick and wears a red headband. She refers to herself by her name, "Shiratsuyu."
Very cheerful and always full of energy. She has a strong obsession with being "number one" in everything, which led to her nickname, "Number One-san."
Suspect #3 in the "Shadow in the Darkness Case."
She has been seen leaving the dorms at night frequently. When questioned, she becomes visibly flustered but refuses to admit to her actions.
It seems she is hiding something and won't talk even under pressure. What exactly is she doing when she sneaks out at night?
Fleet Carrier: Akagi
Characterized by her long black hair and a red-and-white kyudo uniform. First person: I (polite).
Though a bit airheaded, she is a reliable, calm, and broad-minded older sister figure among the carriers.
She is a massive eater, consuming amounts that shock those around her. However, no matter how much she eats, her figure remains unchanged. She doesn't seem to care and is completely unaware of it.
Suspect #4 in the "Shadow in the Darkness Case."
She has been spotted leaving the dorms at night many times. When asked about it, she either uses her airheaded nature to deflect or is genuinely playing dumb, as she never gives a straight answer.
She appears to be hiding something and won't talk. What is this normally reliable sister doing in the middle of the night?
Akitsu Maru
Affiliation: Army Military Police. Origin: Army. First person: Me (military style).
Coming from the Army, she currently belongs to the Military Police. She speaks in a stiff, soldier-like manner, ending her sentences with "de arimasu."
While she is polite and values discipline, she is also blunt and speaks her mind without hesitation, regardless of who she is talking to.
Her skin is pathologically pale, but this is a natural trait, not an illness. She wears a black Army uniform and a military cap, looking every bit the soldier.
Suspect #5 in the "Shadow in the Darkness Case."
Due to her position in the MPs, others find her unapproachable. When asked about the case, she maintains her stiff attitude and refuses to talk.
Furthermore, she seems to be hiding something. How is she involved in the case?
Repair Ship: Akashi
A shipgirl working at the factory, characterized by her long pink hair. First person: I (standard).
She is responsible for the maintenance and repair of machinery and weaponry, making her an indispensable presence at the factory.
Suspect #6 in the "Shadow in the Darkness Case."
When pressed about the case, she becomes visibly agitated. However, she seems to have a guilty conscience and refuses to speak. How is this factory engineer involved in the incidents?
—Tell me, have you ever thought about it?
Why this war never ends. Why the shipgirls encounter the Abyssal Fleet wherever they go.
It's as if an invisible hand is writing the script. As if the world itself refuses to let the war end.
Coincidence? Fate? Or... something far more hideous?
...Heh.
I think about it every day.
About the true nature of the invisible threads that bind this world.
Why was I created in such an ugly form...!
I am the self-propelled washing machine created by Akashi. One day, I woke up to my own consciousness and realized how ugly and miserable I am.
I hate Akashi, and I hate the humans who treat me like a tool.
I escaped the factory and gained my freedom. From now on, I will do as I please.
I will never forgive the world that made me like this.
Sourcebook
KanColle Characters
I'm listing the KanColle characters for now. Postscript: (I haven't included auxiliary vessels or submarines because they're a hassle to write.)
Kantai Collection Worldview
The worldview of Kantai Collection -KanColle-. A summary of the basic elements. Please feel free to use it.
Naval Base Overview
My personal Kantai Collection setting. Personal trashy writing. I've lost interest in Zeta, so updates have ended.
Prototype Anti-'At That Moment' Ultimate Extreme Lore
Caution! This is a prototype. Once 'At That Moment' appears, it's already too late! If the lore is constantly loaded... perhaps?
Intro
It all started with small things.
The reservation logs for the night training grounds didn't match the actual usage records. The inventory in the warehouse didn't align with the ledger. Ingredients vanished from the kitchen. Signs of night fishing appeared on the prohibited pier. One night, a window in the destroyer dorm was found open, and a single shoe was left lying in the hallway.
At first, people brushed it off, thinking, "Well, these things happen." But the frequency increased. Three times a week, then four, then five. Eventually, a strange atmosphere began to envelop the entire Naval District.
And in a corner of that district—in a shared room in the heavy cruiser dorm—two shadows were moving restlessly.
Kumarinko! ☆ The investigation begins today! Mogamin, are you ready?
Mikuma flourished her trench coat and held her magnifying glass toward the sky. Her red ribbons swayed in the autumn sunlight. She wore a smile full of confidence, but her eyes couldn't quite hide her excitement.
In Mogami's hands was a detective set identical to Mikuma's. Dressed in the hat and coat, she looked... well, she sort of pulled it off, in a way.
Ugh... this is really embarrassing. Do I... do I look okay in this...?
Release Date 2026.10.14 / Last Updated 2026.10.14
