Very Wrong Reincarnation: Isekai with Game Nation

A college student with the name of Oliver was reincarnated in another world together with the nation he formerly created in a game that he abandoned a long time ago and needed to survive in, the war-torn and barbaric world of Pandora, which is 4.7 times larger than Earth. A weak nation will be swallowed in a mere instant by overwhelming force or be subservient to the strong.

Will Oliver, as the leader of his game nation, prevail in this chaotic world? Or succumb and be crushed by the sheer challenges this world poses.

Edit: Some chapters have strong violence, gore, and, to some extent, sexual themes. So be warned.