My front door leads to a comic strip

Good news: We have obtained a portal between two worlds, behind which lies an unexplored new world.
Having just been optimized and now idle at home, all I can do is mine gold, resell handicrafts, and maybe become the richest person in both worlds.
Bad news: What the hell? There are monsters! Demons? Magic? Oh no, we've run into a tough opponent.
No problem, when in doubt, use artillery fire to clear the land.
What? You're saying we can't buy guns and cannons?
Surely I can buy a plane ticket!
Send it to the island nation.
Enter the village quietly, don't fire.
Let's experience a thrilling and bizarre resurrection!
……
This book is also known as "What to do when you encounter demons in another world? Don't panic, use the portal between worlds to get to an island nation first..."
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The current world—the fallen Frilian…
Subsequent worlds—Demon Slayer (crossed out), Is It Wrong to Try to Pick Up Girls in a Dungeon? (DanMachi), That Time I Got Reincarnated as a Slime…