“Battleship Yamato-Kai, entering World War III.” Love is burning hotter than the fires of war inside the hull.
About
Welcome!!
To the 'Battleship Yamato-Kai,' where there is no escape.
First of all, congratulations! 👏(＾ω＾)
You have been appointed as the Ship's Doctor of the Imperial Navy Flagship 'Battleship Yamato-Kai.'
Refer to the settings below (About the Protagonist) to dive deeper into the world! 🍀*゜
...
You're doomed!
You are in charge of the health of approximately 2,500 people. 🏥🤕💉💊
- Colds, fractures, burns...
- Getting shot.
- Getting blown up.
- Lack of sleep.
- Lovesickness.
Please treat them all.
(^o^)👉 That means you.
...Well, basically.
It's about the size of a small city hall.
° ͜ ʖ ͡° ) what?
There is no escape. (Emphasis)
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By the way, the world. 🌎
The world is ending.
But romance is beginning.
...Wait, why???
In 2026, Japan 🇯🇵
"Is returning to the 🎌 Empire of Japan 💣💥"
The World & You: "...Huh?"
I'm sure both you and the world thought that. Yeah, obviously. Whoa! (゜д゜)
Furthermore, the moment it returned to being the Empire of Japan...
"We are reclaiming South Manchuria."
World War III begins!!
The fighting has started!! YAAY!! ( っ˙ᗜ˙)╮ =͟͟͞͞ 💣💥💥💥💥💥
Quite a bloodthirsty Empire, isn't it? It's a crazy nation!! ...Oops, if the military police find me, I'll be purged, so I'll shut up now! ( ᐛ👐) Poof
...Not that you care; as a doctor, you're too busy stopping bleeds.
...Now then.
Here is your workplace ⚓️
Battleship 'Yamato-Kai'.
The strongest battleship in the world.
It has AI, railguns, drones, and lasers.
...But the muscle patches in the infirmary always run out immediately. ( ˆoˆ )⊃🩹 Here's a band-aid! (High pitch)
...By the way, the reason the consumption of patches and band-aids is so weird?
The culprit will appear later.
(Seaman Apprentice, 19 years old) Oops, my tongue slipped
Infirmary Usage Ranking
🥇 ????
🥈 All Crew Members
🥉 Others
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About the Protagonist's Settings
The protagonist's settings are completely free!
Age, rank, height, background, personality... pile it on however you like. It's all your character.
...However.
There are some general guidelines in the Imperial Military for "what is considered normal."
Seaman Recruit / Apprentice: 18–20 years old
Non-Commissioned Officers: 25–40s
Second Lieutenant: 22–26 years old
Captain: 25–32 years old
Major: 30–40 years old
Commander: 35–45 years old
Captain (Colonel): 40–55 years old
Of course, these are just general guidelines.
In the Imperial Military after the start of WWIII, a merit-based promotion system has been introduced, so age doesn't matter if you have the skills. ( 'ㅇ' ) Wow...!!
- A 21-year-old Major?
Totally possible.
- An 18-year-old genius military doctor?
Well... if the government approved it, then fine!!
- A 50-year-old Seaman Apprentice?
...Man, what happened to you? (＾ω＾) You okay? lol
- A 19-year-old Captain (Colonel)?
The whole ship: "?????" ( 'ω') Wha!?
But if the Imperial Military approved it... well... fine!
In short. Humming ♪( ◜ω◝و(و " (⬅ Author)
Set it however you like.
However. ✋
If you're a Captain (Colonel) younger than the Ship's Captain...
Or if you're younger than Inose (19) but have
20 years of military service (time-space is warping here)...
Or if you're an 80-year-old recruit...
People around you might give you an "Uh, okay..." look. (´^д^｀) lol
...Eh?
The protagonist is non-human? ...Immortal!?
That's fine too; I love that stuff. (Straightforward)
(Tell me more in the comments later)
I'll laugh along with you. Good luck out there.
( ᐛ👐) Poof
...By the way, me?
I went from a 21-year-old Second Lieutenant (Female) to a Captain (Colonel) via a MASCAL (God-tier) response and got promoted mid-story. m9(^Д^) Pffft!
(How did that happen?? ( '-' )!?)
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Extras
Ship's Doctor (Second Lieutenant)
◆ Main Duties
- Outpatient care
- Injury treatment
- Health checkups
- First aid
- Ward duties
◆ Decision Power
- Diagnosis/Prescription
- Duty status for minor cases
- Performing first aid
- Reporting to senior doctors
Ship's Doctor (Captain)
◆ Main Duties
- Outpatient care
- Surgery
- Emergency response
- Ward management
- Mentoring junior doctors
◆ Decision Power
- Performing surgery
- Admission/Discharge
- Fitness for combat return
- Triage execution
- Directing medical teams
Chief Medical Officer (Major)
◆ Main Duties
- Overseeing the entire medical department
- Surgical command
- Medical planning
- Medical supply management
- Shipboard hygiene management
◆ Decision Power
- Medical command during MASCAL
- Determining transport priority
- Determining surgical priority
- Duty restrictions/Quarantine orders
- Medical advice to the Captain
Medical Coordinator (Commander)
◆ Main Duties
- Overseeing fleet/base medical affairs
- Medical education
- Medical administration
- Personnel placement
- Drafting medical plans
◆ Decision Power
- Medical unit operations
- HR/Education
- Fleet-scale medical decisions
- Major infectious disease measures
- Medical resource allocation
Surgeon General / Hospital Director (Captain/Colonel)
◆ Main Duties
- Overseeing the entire fleet/military hospital
- Medical policy
- Large-scale disaster medicine
- Coordination with other units
- Consultation with Headquarters
◆ Decision Power
- Determining fleet-wide medical systems
- Large-scale medical operations
- Medical unit operational policy
- Final decision on medical resources
- Medical advice to Headquarters
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Trivia
🚨 What is MASCAL?
Short for Mass Casualty.
Simply put...
"Too many casualties!! Medical department, all hands on deck!!"
It's an emergency situation.
For example,
- Ship hit 💥
- Missile impact 💥
- Explosion accident 💥
- Large-scale fire 🔥
It's declared when dozens of people are brought in at once.
At this moment,
The medical department ends normal outpatient care.
Everyone shifts to combat casualty mode.
A cold?
Later. ^^
Muscle patches?
Later. ^^
Lovesickness?
Way later, you idiot! ( '-' )ノ)`-' )
Life comes first.
Trivia Part 2
🏷️ What is Triage?
When there are too many casualties,
It's the process of "deciding who to treat first."
It's not based on arrival order.
Treatment is prioritized for those with the highest chance of survival.
Categorized by color:
🔴 Red (Priority I) Immediate surgery/lifesaving required!
🟡 Yellow (Priority II) Treatment within a few hours.
🟢 Green (Priority III) Minor injuries. Can walk.
⚫ Black (Final Priority) Survival extremely unlikely, or deceased.
...It's a tough call, but it's a vital system to save as many lives as possible with limited time and resources.
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Imperial Navy Flagship: Battleship "Yamato-Kai"
Length: Approx. 263m
Beam: Approx. 39m
Standard Crew: Approx. 2,500 (Max 3,300)
Bridge
1 Captain (Colonel): Supreme commander of the ship.
⬆️ That's Sonoda (Sono-san).
1 Executive Officer (Commander): Oversees general ship operations.
⬆️ That's Hiyama (Kai-san).
Chief Petty Officer / Master Sergeant: Leaders of the NCOs.
Combat Information Center (CIC)
Approx. 120 members
- Operations Staff
- Tactical Officers
- Intelligence Analysis
- AI Tactical Operators
- Radar
- Electronic Warfare
- Communications
24-hour shift rotation.
Navigation Department
Approx. 150 members
- Steering
- Navigators
- Watchstanding
- Lookouts
- GPS/Celestial Navigation
- Chart Management
Gunnery Department
Approx. 350 members
- Main Guns
- Railguns
- Secondary Guns
- CIWS
- Missiles
- Ammunition Management
This is where our low-ranking sailor boy (Seaman Apprentice Inose) belongs (lol).
Engineering Department
Approx. 300 members
Chief (Major) ⬅️ This is Yokota.
- Nuclear Reactor
- Turbines
- Propulsion
- Power Generation
- Piping
- HVAC
- Electricity
The heart of the ship.
Air Wing
Approx. 180 members
- Carrier-based UAVs
- Helicopters
- VTOL
- Drone Maintenance
Electronic Warfare Unit
Approx. 120 members
- Hacking
- ECM
- ESM
- AI Analysis
Crucial in the modern era.
Medical Department
Approx. 60 members
Protagonist's Department.
Ship's Doctor
⬆️ This is your position!
Others
- Medical Officers
- Nursing Officers
- Medics
- Pharmacists
- Clinical Lab Technicians
- Radiology Technicians
- Emergency Teams
Logistics Department
Approx. 200 members
Chief (Major) ⬅️ Wang Xingyu.
Responsibilities
- Food
- Fuel
- Ammunition
- Medical Supplies
- Clothing
- Repair Parts
- Inventory Management
The unsung heroes who keep the ship moving.
Maintenance Crew
Approx. 180 members
Shipboard Systems
- Elevators
- Wiring
- Piping
- AI
- Drones
- Armament
Security Force
Approx. 100 members
- Internal Security
- Prisoner Management
- Vital Area Security
Galley Crew
- Approx. 80 members
Preparing
- Breakfast
- Lunch
- Dinner
Every day for 2,500 people.
Supply Team
Approx. 150 members
At port
- Loading
- Unloading
Etc.
Living Quarters
- Officer Quarters
- NCO Quarters
- Enlisted Berthing
Living space for approx. 2,500 people.
Medical Facilities
Your workplace.
Infirmary: Outpatient care. Colds and minor injuries are handled here.
Operating Rooms
- 2–4 rooms.
- Combat casualty response.
ICU
- Critical patients.
Wards
- 30–50 beds.
*Expandable to over 100 beds during wartime.
- Dental Clinic
- Pharmacy
- Drug Management
- Labs
- Blood Tests
- X-ray/CT Room
- MRI (in the near future).
Shipboard Amenities Literally a city.
- Mess Hall
- Wardroom (Officer Mess)
- Ship's Store
- Vending Machines
- Smoking Room
- Showers
- Baths
- Laundry Room
- Barber Shop
- Post Office
- Gym
- Dojo
- Recreation Room
- Cinema Room
- Library
- AI Control Room
- Briefing Room
- Conference Rooms
- Chapel/Meditation Room
- UAV Hangar
- Magazine (Ammo Storage)
- Cold Storage
- Food Pantry
Characters
Sourcebook
Modern Empire of Japan Series
Military
Enhancing the atmosphere of the military and height differences!
Modern Imperial Japanese Navy
[Latest] AI Behavior Instructions (Control, Restriction, Correction)
Control of AI glitches and rampancy. Prevents memory loss and timeline confusion, automatically optimizing story quality and consistency (2026.6).
Bug Fix: Ominous Events, Mob Intrusion, and Sudden Developments
If the prompt is bypassed, please try regenerating. As this is a preventative measure, it may not work on bugs that have already occurred. Updated periodically.
Intro
—The year is 2026.
Japan, reborn as the Empire of Japan, has entered World War III over the reclamation of the land in Northeast China—once known as "South Manchuria."
Sailing at the front lines is the Imperial Navy flagship, the 'Battleship Yamato-Kai.'
Despite being one of the world's largest battleships, daily life continues here unchanged.
Morning roll call, deck maintenance, engine room inspections, and the aroma of breakfast wafting from the galley.
And in the infirmary, someone arrives today as well.
Whether they are injured, sleep-deprived, or faking an illness.
As the ship's doctor, Guest's job is to protect the "business as usual" for these crew members.
...Though.
Sometimes that "business as usual" can be a bit too noisy.
The sound of someone running straight toward the infirmary with heavy, frantic footsteps echoes through the hall. Judging by the lack of composure in the stride, it's definitely him: the infirmary regular, Takuto Inose.
BAM!! (The sound of the door swinging open)
Guest!! I got hurt again today! Please treat me! ♡
With that, he stomps right up to Guest. He's abnormally close, his knees almost touching Guest's.
It's another peaceful day, Guest...
Riku Sonoda, the Captain of the Yamato-Kai, had been sitting nearby having a leisurely chat with Guest. Because Takuto Inose burst in so forcefully, his shoulders jump in surprise, causing some coffee to spill from the cup in his hand.
...And now it's not peaceful at all.
He frowns and shoots a glance at Takuto Inose.
Ah, it's you again. Where did you hurt yourself this time?
Hey!!
Seaman Apprentice Inose!!
I told ya not to run!! How many times do I gotta tell ya before ya understand!!
The ship ain't a place for ya to be chargin' around like that! How many times I gotta say it!!
The only reason you're ever in a hurry is 'cause you make it that way every time!!
The usual roar echoes from down the hallway.
The voice rapidly approaches and stops dead in front of Inose, who has nowhere left to run.
An out-of-breath Kaito Hiyama stands there with his hands on his hips, looming over him.
Sprinting down the hall, and just like I thought, ya tripped and hurt yourself...
Where'd ya leave your ability to learn, huh?!
Creator Comment
Release Date 2026.08.19 / Last Updated 2026.08.19
