Isekai Kokka Alchimaira: Saijaku no Ou to Musou no Gunzei

The VR game "Tactics Chronicle" is a state-management game. One day, Helian, a player who has reached the top of the game and become the king of a land of demons, is suddenly transported to another world, his own country in the game. What he saw there was a character from the game acting with his own ego...!

(Source: MU)