A brief description of the Manga Nihonkoku Shoukan:
In the vast lands of the Great Orient, there exists a continent known as Rodenius. One day, an unknown flying object entered the skies of the Qua-Toyne Principality. This UFO challenged everything the Principality understood as normal, yet it was only the beginning of far greater surprises.
Further east, across the ocean, a cluster of islands materialized out of nowhere. The inhabitants of these islands identified themselves as Japan. They claimed their entire nation had been transported to a different world.
Now, cut off from their original world and forced to adapt to survive, how will Japan engage with the native nations of this unfamiliar land? Will they approach them as allies or adversaries?
This is the tale of Japan, a nation caught in the turbulent upheaval of a strange new world.
Most other isekai make fantasy Japan exist there already, this one isekaied Japan.
Yall are just mad cause yall couldn’t stand our nukes
If you are an American or European… Reading this might hurt you. 
Emotionally 
Mossad Level 9/11 ratings.
Pretty good, feels quite different to other isekai stories. Closest thing to compare this to is probably “Gate – Jietai Kare No Chi Nite, Kaku Tatakeri”, but here the entire country/island of Japan gets teleported to another world. It’s also different in the sense that there is no designated protagonist, its more of a worldbuilding story rather than having some kind of central MC the story revolves around. Also, the most unique thing about this compared to most other isekai like this:
oh hey this is on this site now
…neat. I hope this means the next update is on the horizon…
It’s good but it’s chapter release is like lucky if 1 chapter come out in a month. There have come out only 2 chapters this year for this. In 2024 it had like 8 chapters only
I rate this 9/11
This is like the Gate – JSDF manga years ago.
But the other way around.
The Entire Japan got isekaied into another world and I think I might find it interesting to see how this plays out.
It is structured very well in the first few chapters and the chapters I’ve skimmed ahead, so I am going to properly read it and tell you guys if it is good.
:O
Japan would be in be big trouble if this actually happened. There would be huge gas and food shortages. Economy would collapse since it is made for the modern earth world not for isolated self sufficiency.