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I Was a War Game Addict, Now I Command a Modern Army in Another World

LittleDrowskie
7
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The average realized release rate over the past 30 days is 7 chs / week.
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Synopsis
Tanaka Haruki was an ordinary salaryman with an unusual obsession — military history, tactics, and war games of every era. From ancient formations to modern warfare systems, he studied it all as both hobby and discipline. But everything changes when he is suddenly transported to another world with a mysterious system that allows him to gain power by completing quests, defeating enemies, and leveling up. In a world of swords, monsters, and kingdoms at war, Haruki discovers that his greatest advantage is not strength, but knowledge. As his level rises, so does his ability to summon increasingly advanced military technology from another world. From infantry tactics to modern firepower, Haruki must adapt, survive, and rise through a world that was never meant for someone like him. Because in a land of magic and monsters, war is still war, and he intends to master it.
Table of contents
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Chapter 1 - Chapter 1

Haruki noticed three things the moment he stepped into the convenience store: the placement of the exit, the blind spot behind the counter, and the fact that the clerk was exhausted enough to miss both. Not because he was paranoid, but because his mind automatically mapped spaces like a battlefield.

'Quite careless,' he thought.

But Haruki quietly dismissed the thought. Japan was still one of the safest countries in the world, and a convenience store in the middle of Tokyo wasn't a battlefield. Thinking otherwise would be absurd.

Haruki casually smiled as he placed his items on the counter.

"Rough night?"

The clerk let out a tired laugh, rubbing his eyes. "You have no idea."

Haruki nodded politely, as if acknowledging a soldier after a long shift. He didn't press further. People talked more when they weren't interrogated.

The transaction was quick. Familiar. Routine.

Yet as Haruki reached for his bag, the store lights flickered once — so briefly that most people wouldn't have noticed.

Haruki did.

'What was that?'

Haruki paused with the plastic bag half-raised, eyes shifting toward the ceiling lights.

They were steady again.

But he couldn't shake the uneasiness building in his chest. Haruki stepped out of the store, the automatic door sliding shut behind him with a soft chime.

He paused on the sidewalk.

Something felt off.

His eyes moved slowly across the street, then to the reflections in the glass, then to the steady flow of pedestrians passing by. The crowd was heavier than usual, but not in a way that stood out. Just the natural surge of Tokyo at this hour, as people of all kinds and type filled the streets on their way home or deeper into the city's commercial and entertainment districts.

Nothing appeared unusual — but the feeling didn't fade.

He wasn't a trained soldier, nor had he ever tried to become one. But Haruki had always trusted his instincts in moments like this when logic and observation didn't immediately offer an answer. And right now, his instincts were insisting that something was wrong.

Haruki slowed his breathing without realizing it.

He told himself it was nothing. Just fatigue, maybe overthinking. Still, his eyes continued to move, gaze and focus sharper, more deliberate than it was moments ago. He began to notice things he had ignored moments ago. The rhythm of footsteps. The spacing between people. The way conversations overlapped into a steady urban hum.

Everything was normal.

And yet… something about it wasn't. As he stepped forward, he caught it at the edge of his vision.

A man across the street moved — then, for an instant, his motion skipped, like a frame missing from a video. 

Haruki stopped walking.

He turned his head slightly, eyes locking onto the same spot across the street. The man was still there. Moving normally, as if just moments ago was nothing but a lie.

Haruki exhaled slowly.

'A trick of perception, maybe. Fatigue. Light distortion.' he thought. At least... that's he wanted to believe, but he couldn't tear his eyes away from the man.

He waited. Watched.

The man took another step.

This time, Haruki saw it again. Not a mistake — another skip. A break in continuity, like the world had failed to render a single frame.

His gaze sharpened.

It wasn't just him.

Haruki's gaze shifted across the street, his gaze turned sharper.

A woman near a crossing light took a step forward, and for a fraction of a second, her movement fractured. It was not a full stop nor a stumble. A clean discontinuity, as if the world had failed to render her motion properly before catching up.

Then it happened again.

A man beside her turned his head, but the motion arrived slightly late, like sound out of sync with image.

Haruki's expression didn't change, but his focus narrowed. The city around him was still functioning but not in a way that made sense anymore.

The flow of pedestrians remained intact, yet individual movements no longer aligned with the rhythm of reality he instinctively understood. It was subtle, almost ignorable. Except that it kept repeating.

Like a system degrading under load.

A distant car passed through the intersection.

Haruki watched it carefully.

The motion was smooth for a moment, then the sound arrived a fraction too late, detached from the visual by a thin, unnatural delay.

His fingers tightened slightly around the plastic bag handle without him noticing.

Something fundamental was starting to slip.

And then —

The world stopped.

It wasn't exactly silence. Haruki could still hear the echo of distant movement, the faint residue of the city's noise. But it no longer progressed. It hung, suspended, like a paused recording.

A pedestrian mid-step froze in place across the street. A passing car held perfectly still, suspended in the intersection. Even the flicker of a traffic light ceased halfway through its cycle, locked between states.

Haruki didn't move.

He couldn't tell at first if time had stopped or if he had simply been removed from it.

Then something appeared.

Not in the air. Not on a screen. Not in front of him in any physical sense.

It appeared within his perception, as if his mind had been given something it was not originally meant to process.

A faint translucent interface flickered into existence at the edge of his vision.

Haruki's eyes shifted slightly, instinctively trying to focus on it.

The moment he acknowledged it, the text stabilized.

----------------------------------------------------------------

[SYSTEM INITIALIZATION IN PROGRESS…]

[SYNCING USER CONSCIOUSNESS…]

[IDENTITY CONFIRMED: TANAKA HARUKI]

----------------------------------------------------------------

Haruki's expression shifted slightly.

A flicker of surprise surfaced before he pushed it down, forcing his thoughts into something more controlled. He tried to focus, analyze the situation he was in.

Because whatever this was… it had just addressed him by name.

He tried to make sense of it, but every explanation he reached for fell apart almost immediately.

As if responding to his attempt to understand it, the interface flickered.

The text shifted, stabilizing into something clearer.

----------------------------------------------------------------

[INITIALIZATION COMPLETE]

[WELCOME, USER: TANAKA HARUKI]

----------------------------------------------------------------

Haruki's gaze hardened slightly.

'This doesn't feel like a hallucination.' he thought.

Haruki's focus sharpened even more. 

When the interface changed again.

----------------------------------------------------------------

[TRANSFER PROCESS INITIATED]

----------------------------------------------------------------

His eyes widened.

"—Wait!"

The world fractured.

Color drained from the world in an instant, replaced by a blinding white that swallowed everything. Sound, motion, even the sense of his own body.

For a brief, disorienting moment, Haruki couldn't tell if he was standing, falling, or simply… gone.

And then...

Nothing.