When Princess Syalis is abducted and taken to the demon king Twilight's castle as a hostage, neither the castle's demonic ruler nor his subjects realize the trouble they've brought upon themselves. The deceptively adorable princess is actually a holy terror who has no difficulty sneaking out of her cell, destroying property, and murdering the creatures she comes across all for the single-minded purpose of getting a perfect night's sleep. The dumb-as-rocks hero Dawner has been sent to rescue Syalis and bring her home, but his mission seems unlikely to succeed anytime soon; and in the meantime, the demons must deal with their ruthless royal prisoner constantly causing an uproar in the castle. While the princess rests in peaceful slumber, her captors may never sleep again!