I normally don't write reviews but I am hoping this gains more popularity. The simulation is really interesting. I think 13 civilizations is a bit too much and they probably should have started out and fleshed like 7 of them instead. The characters are a bit generic but as a battle manga, I think it does well to show the different tropes. Overall feels like a unique story and the different natural enemies makes you guess what will happen next. Specially when the demon lord jachi beat the alien who then gets destroyed by the giant army. So the constant power struggle is great