The Gray Dawn of the End of the World

In the year 2111 of the Blue Star Calendar, strange alien biological weapons that called themselves "God Envoys" were carried by the alien battleship "Erdan Gaien" and arrived on the Blue Star. Humanity was forced to enter the "Advent Era" and called them "Alien Envoys". In order to fight against the alien biological weapons and alien envoys, the only remaining sovereign countries of Blue Star formed a coalition government and launched the SAVIOR mecha combat plan, and the GODSLAYER mecha was born. (This work is purely fictitious! Any duplicate names are purely accidental!)