Ever since an event known as the Disaster, monsters and mayhem rule the world. There are those lucky enough to live inside the Fence, while those who don't, are treated little better than the beasts that they fear.

There is an island in the sky, and not everyone can see it. A harmless village boy living in the rural lands, Iolani Tori is afraid of heights and loud noises. Taken by surprise when he receives a mysterious letter addressed to him, Io finds out that the floating island wasn't a figment of his imagination after all. A talking sparrow; An eagle's eye, A waiting vulture And a silent night.