my main problem with this manga is the speed with whivh japan became functionnal in another world. they are acting as if all they need/use from the other countries on earth is food and oil.
they dont seem to have the satelites transfered with them, I am sure japan has the technology to create new satelites and send them in space but that would take time. if they had satelites, the first way to inspect the new world they arrived would be threw satelites and not a recon plane, if there are actually strong countries and you violates their airspace, you are starting the contact in disadvantage or even war if they are able to shoot the plane down.
does all the japanese websites opperate on 100% servers in japan? how does that influence the industry?
why does japan keep its old constitution in a new world? there are a lot of limits that were imposed by the winning countries of WW2 that no one can force them to follow anymore.
without satelites, can japan have direct communications with the troops they are sending far away?