Civillain whispers echo through the village market, and servant whispers echo through the halls of the castle. Rumours of a princess, who is kept locked in the castle.  The workers who serve her are sworn to secrecy, so that no one can be sure if she even exists.  A rival kingdom is eager to find out if she is real, and they'll stop at nothing to find her.

Servant Shownu's Route from base story Fade Into You Read the prologue