The most important final exam is coming at the fairy school, as a result of which every little sorceress must acquire a unique magical ability. Fairy Rainbow is very worried, because magical abilities are given only to those who have done many good deeds, and she has not yet boasted of a single good deed can not. True, on the day before the exam, the Rada found a mysterious bottle on the river bank with a mysterious message in which it was asked for help. What a great opportunity to prove yourself and pass the exam! The fairy hastened to the rescue of the stranger and had no idea what unexpected adventures her brave campaign would turn out to be!