Welcome to the Demon Castle Database!

My goal is to create a comprehensive database for everything related to the "Sleepy Princess in the Demon Castle" franchise!

Written and drawn By Kumanomata Kagiji, Sleepy Princess in the Demon Castle (a.k.a. 魔王城でおやすみ / Maou-jou de Oyasumi) is a serialized manga in Weekly Shōnen Sunday that follows Aurora Syalis Goodereste as she terrorizes the Demon Castle in search of new and inovative ways to sleep. This series has a heavy focus on comedy, characters, and world-building (the latter two being the reason for this database's existance). There is much to learn about the demon realm, the human nation of goodereste, and the rest of this world!

Main Characters

Newest Volumes

˅ Purchase the manga here ˅
Sunday Viz Manga Book☆walker Amazon eBook Japan CDJapan

About helping.

There is a Sleepy Princess Discord where people talk about the series, a select few are helping me with this project (aswell as the fandom wiki).
Feel free to join in as long as you're respectful!!! Sleepy Princess Fan Discord

Website Still Under Construction !!!

Manga Page: Mostly Completed Volumes, Chapter Pages not yet added

Character Pages: Heavily Under-Construction

Kumanomata's Twitter Feed

Updates

[2026/02/14 - 11:30am]

• 16/32 Manga pages partially complete
• Over half the characters added! Most pages still empty
• Updated some more visuals.

[2026/02/09 - 6:15pm]

• New Characters, More Pages Complete.
• Manga Page is functional! a few Volume entries are complete.
• Updated some visuals.
• Added link to public sleepy princess discord!
• Speeding up work going forward! :D

[2025/07/01 - 10:30pm]

• Updated the look of the All Characters page
• Updated profiles of multiple characters.
• Added some non-functional pages.
• Added a bunch more characters, began work on the locations page (still under heavy construction).

[2025/06/23 - 7:00pm]

• Almost all character pages work, some pages don't have complete functionality or are missing some basic elements.
• Updated profiles of multiple characters.
• Updated functionality of some character pages.
• Added some non-functional pages.
• Added more characters than I care to list.

[2025/06/19 - 12:00am]

• Updated profiles of multiple characters.
• Updated functionality of some character pages.
• Updated functionality of Class Changes page. (page is still under construction)
• Added Bianca & Necro.
• Added Aurora Como Lis Goodereste.
• Added Agave.
• Added Demon Castle Renovation Unit.
• Added Vampire.
• Added Zeus.
• Moved Hypnos to the Demon category.
• Moved Paladin Evening Star to the Human category.
• Adjusted certain elements to size better on different screens.
• Fixed some typos.