The royal Siegfried clan has gone a century without producing an heir who can wield the power of God, so its children are subjected to secret experiments intended to awaken that ability. Crown prince Sigurd endures the program hoping to spare his younger sister Brunhild, but returns years later powerful, unstable, and profoundly changed. When Brunhild eventually manifests divine abilities of her own, she is summoned back into a court where family loyalty, succession, and survival have become dangerously entangled.