A princess is kidnapped by a demon king and held prisoner in his castle. But the princess just wants to spend her time either sleeping or causing trouble for the demons.

Sshhh. Princess Syalis is trying to get a good night's sleep. Some shut-eye. Forty winks. Catch some Z's. Long ago in olden times when people and demons lived together in well, disharmony really, a demon king kidnaps a human princess and imprisons her in his castle. Bereft, the princess's subjects, beat their chests in anguish until a hero arises to spearhead "Project Rescue Our Princess". While waiting for her knight in shining armor, what's an imprisoned princess to do? Teddy-bear guards with bat wings are all very well, but her dungeon cell is boring. So, she decides to wile away the long hours by sleeping. Now if only she could get comfortable and didn't suffer from insomnia.