The Demon King who destroyed the strongest cavalry corps in the Sengoku Era.
That one battle single-handedly revolutionised the very notion of warfare.
With their unreliable aim, and need for time-consuming reloading, firearms are simply not suited to the battlefield -
such was the common consensus.
"But if that's the case, why can't we just line up as many as we can and fire away? You know, in turns?"
――And now, the Demon King has revolutionised the firearm once again.
Incidentally, the name "rotary matchlock" is misleading; it is a matchlock equipped with a rifled barrel, rather than a gatling gun.
"What's that? A gatling gun? I-I want one of those too!"