Gave this manga a random read and got immensely impressed. In a nutshell, this series very similar to the anime GATE but on hardcore mode. They make it very apparent in the first chapter the scale is a lot larger than any would expect. The idea of hummanity making the first move to invade other worlds before a bad event in the future gives off movie vibes. Various nations across the earth are working together while in a sort of competition for hummanity's survival. The MC may be a decent college student, but he is smart. He sticks to his values while interacting with the game like fantasy system while makinguse of tech to survive.
It's also a funny bonus to see Japanese Prime Ministers backing him up as he is basically the gem of Japanese pride.
To top it off, the art style is so damn impressive, I found myself reading some chapters twice to take it all in.

Excellent manga, I will actively look an eye out for future updates.