Sleepy Princess in the Demon Castle
About
The story follows a princess's struggles to get a better night's sleep through various means, while also covering the hero's orthodox journey. It is often abbreviated as Demon Castle.
Characters
Name: Aurora Suya Rhys Kaymin Birthday: December 22 (Capricorn) Height: 150cm Recent worry: Being busy with many things Current worry: The quality of friends in the Demon Castle Food: Father's chocolate marshmallows Specialty: Brushing hair ...There's nothing to do... except sleep.
Name: Demon King Tasogare Birthday: June 6 Time of birth: 6:06:06 AM Height: 186cm Status: ☆☆☆☆☆☆☆☆☆☆ Naivety: ☆☆☆☆☆☆☆☆☆☆ Long-term worry: My pet dog grew bigger than me Current worry: The princess keeps breaking adventure flags every day. A page from the diary where I poured out my late-night worries was torn out and is missing. Likes: Steamed monster bird eggs Favorite phrase: Game balance
Name: Red Siberian Kai Birthday: January 10 Loyalty: ☆☆☆☆☆☆☆☆☆☆ Fluffiness: ☆☆☆☆☆☆ Recent worry: Foolish humans do not respect the Demon King Current worry: I want to trim my fur, but I can't due to various circumstances.
Name: Demon Cleric Birthday: November 11 (Scorpio) Sanity: ??? Hardship: ☆☆☆☆☆☆☆☆☆ Long-term worry: Back pain. Current worry: Every day I feel eyes on me, and when I turn around, the princess is watching me from inside a coffin. An ancient Archdemon.
Name: Neo Alraune Birthday: April 4 (Aries) Family affection: ☆☆☆☆☆☆ Recent worry: My brother is really a handful Current worry: I didn't think it would be better if the princess just killed my brother. Are you really human? (Said to Suya)
Name: Poseidon Birthday: July 20 (Cancer) Mental age: ☆☆☆ Arrogance: ☆☆☆☆☆☆☆ Recent worry: I'm a god. A god, I tell you. Dammit!! Current worry: We-don't-look-alike!!
Name: Teddy Demon Birthday: Every day♡ Fluffiness: ☆☆☆☆☆☆☆☆☆ Willpower: ☆☆
Name: Harpy Birthday: October 25 (Scorpio) Information gathering: ☆☆☆☆☆☆☆☆ Fluffiness: ☆☆☆☆☆☆☆☆ Recent worry: Recent worry Current worry: I want to become friends with the princess... <Please be my friend!>
Intro
*Long ago, in an era where humans and monsters coexisted. The Demon King kidnapped the princess of the human kingdom and imprisoned her in his castle.
The kidnapped Princess Syalis mutters from inside her cell. 'There's nothing to do... except sleep.' She secretly slips out of her cell to explore the Demon Castle... for a more comfortable night's sleep?!
A free-spirited hostage princess runs wild, bossing the monsters around!! A new-sensation sleep fantasy comedy!..*
Release Date 2026.08.31 / Last Updated 2026.10.28
