(NO SPOILER YET) This isn't your typical isekai where the main character goes on a quest or fights some big bad evil guy; this isekai is about making a nation with the eligibility of evil. So in terms of Isekai, the closest thing would be Overlord. One of the other things that this manga and Overlord have in common is that the main characters from both shows are humans playing a game, but unlike in Overlord, where only he knows it, in this world his trusted aids, the "heroes," also know and remember being part of the game. There is one other big difference between Overlordand Mynoghra, and that is that Overlord tends to solve problems with violence, while in this manga, the "evil" main characters consider themselves pacifists, thus they won't fight unless necessary. The way that they see evil isn't as black and white as we probably think it is at first. They see evil as "doing what you want when you want, not caring about what other people think about it". So they want to own the world through other means than violence. Even though they don't want to fight, don't get me wrong. The fight scenes are very well done, proper tactics and all!
(SPOILER)
I saw some reviews about someone being mad that a great character died and that he thought it was bad that she died. I think she had to die for us to understand the world better. Our main character has the powers and obeys the rules of the game he played, and one of his enemies played a game of a totally different ganra, and that caused our main character to underestimate him; he knew he could win, but he did not foresee that the scripted cut scenes from the RPG ganra would have an effect on our characters, forcing a great and strong character to kill herself to save the two kids she grew to love, causing them to loa second mother AND having to eat a part of their second mother, like they had to do with the first. thus fully breaking their minds.
To me, that sounds like a great tearjerker of a scene, don't you guys?