Kazuya will never forget a piece of advice of his grandmother: a man needs to make a family and never fail to protect it no matter what. He gets summoned into a new world, remembering the words of his grandmother. When Kazuya reaches his new reality, he discovers that it is composed of the grand continent Landia, as well as of many other islands of various sizes. In this peculiar world, besides humans also live: beastfolk, elves, dwarves, half-dragons, and various other species; there are many nations to find: some co-exist with each other, some, however, discriminate against other people. However, about ten years ago, a demon world appeared out of nowhere, a multitude of monsters spilled forth and reportedly drove the countries of the north into chaos. All the nations had decided to fight against the demon invasion together, however, they suffered a repulse; more than a half of the whole continent now belongs to the demons. Kazuya will now have to learn about the new world, he is summoned to and resolve the crisis.

Genjitsu Shugi Yuusha no Oukoku Saikenki starts quite slow and might be quite boring for you to keep reading. However, it has something to offer to the readers. Take for example the fact that Kazuya is summoned in a new world, where he is regarded as a hero. What is interesting about it is the fact that Kazuya does not have the power to singlehandedly defeat the demons and instead of it, he becomes the king of one of the nations that suffers the invasion of the demons. Anyways, to be perfectly honest with you, Kazuya becomes the king of a country that has so many problems to be resolved that it is nothing but a miracle, it has not been invaded yet. And so, Kazuya will need to carry out reforms, conduct negotiations and do everything a king is supposed to do to win the war against the demons.

As I have mentioned it already, this manga has a very slow start; it takes some time for Kazuya to show some development. Yet, after some time, he becomes a more interesting character, he understands that if his decisions are wrong, people will die; he realizes that being a king means dedicating everything to the people; this is where this will start to be interesting.

All in all, if you are looking for an isekai that is actually unique, this might be a great read. However, if you want to see an overpowered hero that saves the day no matter what, I would not recommend you to read it.