A "stateless man" who wakes up in the ruins of the Kingdom of Light feeds on dark energy, but is determined to clean up the filth in the universe.
Zero wakes up in the former site of the Kingdom of Light (now the Ice and Snow Death Star). As a weak "scavenger", he survives by devouring the remaining resentment of monsters and the energy of broken light. He met Hong Kai, a space wanderer who also came to the ruins to hunt for treasure, and accidentally saved Geed, who was attacked by Dark Lops.