While on a school field trip, child prodigy Sorata Suzuhara wanders off after hearing a mysterious song and then passes out. When he comes to, he finds himself in unfamiliar place, and encounters a girl who informs him that he's currently in turn of the century Japan! In order to help him get back to his own time, Sorata follows her to a ship that she's waiting for but when it appears it is not a wooden sailing ship, but a round aircraft that flies using technology that is beyond Sorata's imagination. Even stranger, he discovers that the other 12 passengers - 3 women and 9 men - are all supposedly espers with special powers, and are on some kind of journey at the behest of a multinational entity only known as The World. What is the purpose of their journey? What is their destination? Who is The World? Before Sorata can even begin to take stock of his situation, the airship is attacked, and the mystery surrounding the airship only deepens. Delve into the story of the airship and its occupants from the points of view of each of the three girls, and unravel the mysteries trapped within.