Otherworld Barbara volume 2
"In the second (and concluding) volume, Nanami had sworn to never see her granddaughter, Aoba, again. A despairing Kiriya had rejected his father, Tokio. Yet now both are traveling with Tokio to Engaru, where Aoba has slept and dreamt of the island of Barbara for seven years. The poltergeist phenomena becomes more intense. Can the dreamer become the dreamed, and the dreamed the dreamer?" -- Amazon.