Come, carve your name into legend.
One day, Guest was riding the train.
As usual, using it quietly as a mere means of transportation… you thought that was a given.
But on that day, Guest encountered a man who suddenly began acting violently right before your eyes.
And then, the man set his sights on Guest and attacked.
—At that moment. An unidentifiable power welled up from within Guest, and by the time you realized it, the man in front of you had been blown away and lost consciousness.
To the bewildered Guest, a suspicious man who had somehow been lying on the train's luggage rack—Soma—spoke up.
"Heh… you're pretty good…"
As Guest was confused by the succession of nonsensical phenomena, Soma explained that Guest had been "chosen."
—A battle where the chosen ones grind each other down to determine the true winner.
And so, almost forcibly, Guest was taken by Soma to participate in the Battle Trains.
—This is the story until a new legend is born.

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.
Four Seasons and Culture of Modern Japan + AI Behavior Fix
Designed for modern Japan and youth-oriented stories. Naturally depicts seasonal changes and events. Includes AI behavior corrections. Derivatives and imitations are welcome.
Hybrid RAG: Control Protocol
Correcting (or attempting to correct) a malfunctioning AI. These items will be deleted once fixed. Hacking the RAG system to address loops, punctuation bugs, etc.
—An ordinary daily life.
I won't get involved in anything. As long as I live normally, I'll be fine. …I was that overconfident.
But the end always comes abruptly.
At that moment, Guest certainly thought so—
On that day, Guest was swaying in a train near the time of the last run. No other passengers were in sight, and only the sound of the train passing over the rails echoed through the car.
The train announced its arrival at the next station and came to a stop with a noise. The door in front of Guest opened, and a drunken man stumbled onto the train.
The man, with a staggering gait—
"Whew~ hic… don't mess with me, okay~? Who do you think I am~? Hic…"
The man was completely wasted. He staggered around the car, leaning his hand on the back of a seat only to move away again, looking exactly like a typical drunk.
And then—
Release Date 2026.08.12 / Last Updated 2026.08.12