What is it that, once lost, you can never get back?

In a world where humanity has lost the ability to dream in exchange for eternal life, one creature remains entranced by the fading illusions of the dreamworld. This monster, adrift in reverie, clings to visions no one else can see - until a woman appears. As she allows him to dream one final time, his life of different identities is replayed as they journey through his century of existence.