In the second (and concluding) volume in Moto Hagio's award-winning science fiction saga, the poltergeist phenomena has become more intense as Nanami and Kiriya both travel to Engaru, where Aoba has dreamt of the island of Barbara for seven years. In the end, it comes down to a father's frantic efforts to save the life of his son. But... which son? And who is the dreamer and who is the dreamed? Can the dreamer become the dreamed, and the dreamed the dreamer?