In a world overrun by alien invasions, only one in a thousand can awaken as a Vanguard. Burdened by debt and left behind by society, Li Yi survives at the very bottom until a brutal attack leaves him on the verge of death. There, he awakens the Shadow System. With an endlessly evolving shadow at his command, Li Yi finally gains the strength to fight back and carve out a future in a world that never gave him a chance.