本片是由日本的著名幻想小说家上桥菜穗子的《精灵守护着》改编而来，这是该作者守护者系列的第一部作品。故事发生在和人类世界平行存在的精灵世界里，在精灵世界里有专门负责降雨的水精灵。每间隔着一百年，水精灵会在人类世界的孩子体内产卵，产卵后水精灵会死去。这些被产下卵的孩子们被称为“精灵守护人”，他们会孕育着水精灵的卵直到他们孵化。这些孵化出来的卵会化身为新的水精灵继续接替造云降雨的任务。这次的水精灵守护者是新龙勾皇国的第二皇子，也是故事的男主人公，但是人类社会传史发生了错误。故事的男主人公被大家说是不祥之物附在身上。这个二皇子很快遭到了皇族的秘密追杀，如果水精灵不能被成功孵化，全国会受到大旱之灾。于是皇族第二王妃委托自己的女保镖当二皇子的监护人，带着他在民间谋生存..

This film is adapted from "Guardian of the Spirit" by the famous Japanese fantasy novelist Nahoko Uehashi. 's first work. The story takes place in the elf world that exists parallel to the human world. In the elf world, there are water elves who are responsible for rainfall. Every hundred years, the water elves will lay eggs in the children of the human world, and the water elves will die after laying eggs. These laid eggs are called "elf guardians", and they will conceive the eggs of the water elves until they hatch. These hatched eggs will turn into new water elves and continue to take over the task of creating clouds and raining. The guardian of the water elves this time is the second prince of the New Dragon Gou Empire and the hero of the story, but a mistake has occurred in the history of human society. The hero of the story is possessed by what everyone says is an ominous thing. The second prince was soon secretly hunted down by the royal family. If the water elves could not be successfully hatched, the whole country would be hit by severe drought. So the second princess of the royal family entrusted her female bodyguard to be the guardian of the second prince, leading him to make a living among the people..