Above the clouds is the place which called home by an angel and a spirit of rain. At the same time, it is also the storage of what seem to be known as "stories of every humans" in this planet. Every book is like a novel told by exactly the protagonist. Angel would collect some of them and then narrate it to Spirit of rain. One day, like every normal day - except that it is a little abnormal - when they're about to become absorb in the book's world, all letters vanish. In place of them is a letter written by a human with a cry of help.