Chapter 1

50 years after the 100 hundred years long Human-Siren War, the Siren Empire declared an unconditional surrender to the former organization turned independent militaristic nation of Mars. The Azure Union, humanity rebuilt itself as a Spacefaring civilization.

However, a mysterious stone gate appeared in the city of Titan, the 3rd largest city of the Azure Union and what came out from the gate were new threats. The 50 years of peace was broken, the war machines of the Azure Union roared back to life, soldiers picked up their weapons and put on their armor. The Azure Union knows that peace shall come when the war is over.