Maoujou de Oyasumi

Sleepy Princess in the Demon Castle

What would you like to edit?

Alternative Titles

Synonyms: Sleeping in Devil's Castle
Japanese: 魔王城でおやすみ
English: Sleepy Princess in the Demon Castle
German: Sleepy Princess in the Demon Castle
French: Sleepy Princess in the Demon Castle
More titles


Type: TV
Episodes: 12
Status: Finished Airing
Aired: Oct 6, 2020 to Dec 22, 2020
Premiered: Fall 2020
Broadcast: Tuesdays at 02:00 (JST)
Producers: Lantis, FuRyu
Licensors: Funimation
Studios: Doga Kobo
Source: Manga
Genres: ComedyComedy, FantasyFantasy
Theme: MythologyMythology
Demographic: ShounenShounen
Duration: 23 min. per ep.
Rating: PG-13 - Teens 13 or older


Score: 7.981 (scored by 9362393,623 users)
1 indicates a weighted score.
Ranked: #6202
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #1129
Members: 203,720
Favorites: 2,203

Available At


Streaming Platforms

Ranked #620Popularity #1129Members 203,720
Add to List
Episodes: /12
* Your list is public by default.


The Demon Lord Tasogare's castle is a dark and frightening place, filled to the brim with various monsters. Any soul unfortunate enough to be imprisoned here is sure to be terrified by the horrors within. However, the human princess Aurora Suya Rhys "Syalis" Kaymin is a different case. Rather indifferent to her situation, Syalis worries about one thing and one thing only—sleep. Ever since the demon lord kidnapped her from her kingdom, she has not had a single good night's rest.

To alleviate her dozen dozing issues, the princess makes do with what she can find in the castle. Whether it be the fur of fluffy demonic teddy bears or the silky, blanket-like bodies of ghost shrouds, everything is but a means to ensure a peaceful slumber. With so many potential materials to craft items that can help her sleep at her disposal, nothing will stop the sleepy princess—not even death.

[Written by MAL Rewrite]


No background information has been added to this title. Help improve our database by adding background information here.

Episode Videos

Related Anime

Characters & Voice Actors



Opening Theme

Apple Music
Amazon Music
Youtube Music
"Kaimin! Anmin! Suya Rhyst Seikatsu (快眠!安眠!スヤリスト生活)" by Aurora Suya Rhys Kaymin (Inori Minase)

Ending Theme

"Gimmme!" by ORESAMA


Sep 2, 2023
I'm absolutely obsessed with this anime. I watch the first season and within the year of me watching it I purchased every manga and I'm currently up to date. I feel like people write it off too soon as a cute girly anime on simply how it looks. but anybody that writes it off because of that is missing out on hilarious comedy. Princess syalis is not a force to be trifled with she has no problem cutting down anybody in her path that gets in the way of her good night's sleep. The manga is obviously more better but the anime is just as ...
Sep 3, 2023
Mixed Feelings
“I’m not locked in here with you… You’re locked in here with me!”

The tittle is a big lie, don’t get fooled. Maoujou de Oyasumi is not about a moe kidnapped princess trying to get a good sleep. It is not. Of course not. Absolutely not. This is about a psychopath, serial murder going rampage, mercilessly killing and torturing helpless and unaware demons, without any sort of empathy or regret in her big, star-speckled purple eyes. Her cute, harmless appearance and monotonous, expressionless voice don’t stop her from doing the most atrocious actions, from stealing important army stuffs, torturing people under questionable excuses, or emotionally manipulating ...
Apr 3, 2022
Preliminary (4/12 eps)
Comedic serie if you have an IQ less than 50. How is it that this garbage gets an anime adaptation but other truly comedic serie no? I guess it is the loli as the main protagonist and this tells a lot about the anime industry now a days. Also shows how reviews in this site are basically useless, given it has 8.0 average, lmao.

Plot: 0

What if there was a group of demon with the average intelligence of a 10 year old kid? This including the demon king, and there was a princess that despite wanting to have a good sleep, and having hundreds of occasion ...

Interest Stacks


Recent News

North American Anime & Manga Releases For February

North American Anime & Manga Releases For February

Here are the North American anime, manga, and light novel releases for February. Week 1: February 1 - 7 Anime Releases Adachi to Shimamura (incl. Mini Anime) ( more

Fall 2020 Simulcast List [Update 12/1]

Fall 2020 Simulcast List [Update 12/1]

In this thread, you'll find a comprehensive list of anime acquired for simulcast release during the Fall 2020 season. This list also includes titles that were more

Recent Forum Discussion

Poll: Maoujou de Oyasumi Episode 12 Discussion ( 1 2 3 4 )
Stark700 - Dec 21, 2020
154 repliesby ReaperCreeper »»
Sep 30, 2:09 AM
Poll: Maoujou de Oyasumi Episode 2 Discussion ( 1 2 )
Ashhk - Oct 12, 2020
79 repliesby ReaperCreeper »»
Sep 28, 11:20 PM
Poll: Maoujou de Oyasumi Episode 1 Discussion ( 1 2 3 )
Stark700 - Sep 26, 2020
149 repliesby cursedwormz »»
Sep 16, 3:35 AM
Poll: Maoujou de Oyasumi Episode 3 Discussion ( 1 2 )
Stark700 - Oct 19, 2020
94 repliesby Lazen11410 »»
Aug 20, 7:05 AM
Poll: Maoujou de Oyasumi Episode 5 Discussion ( 1 2 )
Stark700 - Nov 2, 2020
84 repliesby Altadena »»
Aug 4, 8:42 PM

Recent Featured Articles

MAL Staff Picks: Fall 2020 Opening Themes

MAL Staff Picks: Fall 2020 Opening Themes

26 staff members judged 39 songs to bring you our definitive ranking of nearly every opening theme this season!

by Shymander


It’s time to ditch the text file.
Keep track of your anime easily by creating your own list.
Sign Up Login