In 12066 AD, Blue Star was shrouded in a strange fog. Countless monsters, alien races, and divine creatures appeared, causing an unprecedented blow to the originally peaceful life. Humans on the Blue Star are constantly defending their living areas from monster attacks. From time to time, aliens want to invade the Blue Star, and some divine creatures want to spread their own beliefs. After a ten-year war, peace has basically ushered in. This ten-year war is the famous (War for the Defense of Humanity)
