Luna is the only girl who can communicate with flowers in the kingdom that benefits from the special power that flowers possess. One day, however, a turning point comes and she is able to work for the "royal florist" whom she has always dreamed of! However, she is unlucky enough to get caught up in a kingdom dispute and is ordered to take the place of the princess, and is sent as a "hostage" to the dreaded king of the land of the dead, where flowers do not bloom. 花と話せる特別な力を持ったルーナの目標は、亡き両親のように花の恩恵を人々の暮らしに役立てる『花師』になること。 過酷な境遇の中でもくじけずに努力を続けたある日、『王宮花師』に弟子入りする道が開かれる。 それが運命の出会いに繋がっているとも知らずに……。