Imprisoned for a crime he doesn’t even know- prisoner Zero has spent most of his life confined within a golden cage, forever dreaming; yearning; wishing to be free. To make things worse, there are large gaps in his memory, and even the small comfort of knowing one’s name seems to have been taken from him. Only his jailer, the Emperor, holds all of the answers. Fate seems to have other plans for Zero, however. His life takes a turn when a mysterious stranger appears to him one day, and tells him that he's the reincarnation of a legendary hero. But the more he learns the truth about himself, the more he questions his identity.