In a future world, humanity has established a new regime on an alien planet. However, a rebellion composed of robots suddenly rises and seizes a vital mining town under human control. To eliminate the enemy leader, the intelligence center commander, Gale, dispatches his younger brother, Spark, to the mining town on a mission. The mission fails, and from then on, the two brothers find themselves being drawn into unimaginable situations. A massive conspiracy surfaces, overturning their understanding of the world, their enemies, and their comrades. When they come to their senses, the former brothers are now standing on opposite sides…