Noah is a 19-year-old college student who shares his every day life with Akagi, a beautiful red-haired girl. This may sound like an enviable life, if not because in reality, Akagi is a kind of spirit that takes Noah's energy to survive. His day by day seemed to remain unchanged until, during a trip to some ancient ruins, a strange device transports Noah and Akagi to a parallel world where magic and fantastic creatures inhabit, or at least, it seems. How did Akagi end up as a spirit? What is the reason behind Noah's dream visions? Who is the girl of Noah's visions and what relationship does she have with his past? Why were they transported to another world? Noah will have to face the obstacles that are interposed to him in order to recover his lost past, uncover the unknowns after the appearance of Akagi and find the reason why they were called to another world.