Gaikotsu Ou to Migawari no Oujo: Luna to Okubyou na Ousama

Synopsis

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. (Source: Kadokawa, translated)

Anime adaptations