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 (sort of) a cute demon girl and participating in a castle fitness challenge. Her plots to get some shuteye include stealing ice from Frost Demons to cool off on a hot summer night, attempting to make her own waterbed, toying with magic spells and provoking an enchanted flower into releasing a soporific. And then the nightmares begin...