A captured princess just wants a good night's sleep!

Imprisoned in the castle of the Demon King, all that spoiled-sweet Princess Syalis dreams of is a good night's sleep! Shhh...

While waiting to be rescued, Princess Syalis makes herself at home by commandeering a bathtub, befriending a girl demon and participating in a castle fitness challenge. Her plots to get some shut-eye include stealing ice from Frost Demons to cool off on a hot summer night, attempting to make her own DIY waterbed, toying with magic spells and provoking an enchanted flower into releasing a soporific. And then the nightmares begin...

A lovable fantasy series with a cute princess, adorable demons and a charming prince...of evil.
* Releases 4 times a year for 4+ volumes. Series is ongoing.
* A quirky take on supernatural fantasy that borrows elements from Japanese role-playing video games to appeal to fans of hit video games such as Disgaea.
* Recently a handful of manga series similar to Sleepy Princess in the Demon Castle that borrow elements from Japanese role playing games have become best-sellers, including Black Clover and Delicious in Dungeon.