Maoujou de Oyasumi

Sleepy Princess in the Demon Castle

What would you like to edit?

Alternative Titles

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


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
Licensors: Funimation
Studios: Doga Kobo
Source: Manga
Genres: Slice of LifeSlice of Life, ComedyComedy, SupernaturalSupernatural, MagicMagic, FantasyFantasy, ShounenShounen
Duration: 23 min. per ep.
Rating: PG-13 - Teens 13 or older


Score: 8.051 (scored by 3212532,125 users)
1 indicates a weighted score.
Ranked: #4892
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #1549
Members: 86,233
Favorites: 897
Ranked #489Popularity #1549Members 86,233
Add to List
Episodes: /12
buy from amazon
* Your list is public by default.


Sshhh! Princess Syalis is trying to get a good night's sleep. Some shut-eye. Forty winks. Catch some Z's. Long ago in olden times when people and demons lived together in—well, disharmony, really—a demon king kidnaps a human princess and imprisons her in his castle. Bereft, the princess's subjects beat their chests in anguish...until a hero arises to spearhead Project Rescue Our Princess! While waiting for her knight in shining armor, what's an imprisoned princess to do...? Teddy-bear guards with bat wings are all very well, but her dungeon cell is bo-o-o-ring! So, she decides to wile away the long hours by sleeping. Now if only she could get comfortable...and didn't suffer from insomnia...

(Source: VIZ Media)


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

Related Anime

Characters & Voice Actors


Yamazaki, Mitsue
Minase, Inori
Theme Song Performance
Theme Song Performance
Hashimoto, Yukari


Opening Theme

"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

Dec 21, 2020
dlxuniuniu (All reviews)
(Quiet please, our princess is sleeping right now)

How far would you go for THE perfect sleep? It has been scientifically proven that a good sleep is very important for our body, but how can we achieve that? This is the most important thought of our princess Aurora Suya Rhys (or let's just say Suyaaaaa~), she goes all out to get this achievement.

In a time when humans and demons were still hostile, our princess was captured by the demon king Tasogare. He locked her up and just gave her an old mattress and sheet to sleep on. How is our princess supposed to have a restful read more
Dec 21, 2020
Watame (All reviews)
‘I love sleep. My life has the tendency to fall apart when I am awake, you know?’

Once upon a time, people lived happily in the kingdom of Sleepland. A jealous demon king appeared, wishing to destroy the kingdom. He kidnapped the princess and said, ‘I am kidnapping your Princess and if she is dear to you, you will give all your lands to the demons.’ So, just like in any typical fairy tale: an evil and insidious demon king, in order to show these mongrels, who are called humans, who the real king is, kidnaps a young maiden and imprisons her in a cell in read more
Dec 22, 2020
Cocoa_Hoto (All reviews)
'If you got kidnapped and imprisoned by the demons, what should you do?'

Well obviously in this situation, you will always try to find a way to escape from their prisoner. But for this anime, Princess Syalis is the most unique one. She rather sleeps in her prison bed despite the panicking situation that is happening in her homeland.

But there's one problem! The demons only give her nothing but a low quality bed sheet and pillow. Dissatisfied, Hime-sama decides to go out and create the best quality for her to sleep even if it means murdering demons and destroying useful items. What makes the story even read more
Dec 21, 2020
Stark700 (All reviews)
As humans, we all have three necessities in life: breathe, eat, and sleep. If you go extended amount of time without any of these three, then death will await you at open doors. However, sleep is a more subjective and everyone gets different amounts. What about the princess of the human kingdom though? How much sleep does Syalis need every day in her life?

Those coming into a magical-fantasy story like this should keep your expectations in check. This isn’t some complex tale crafted with deep lore or character study. If it can even be called that, Syalis is a princess that wants nothing more than read more

Recent News

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

Q4 2020 Anime & Manga Licenses [Update 12/14]

Q4 2020 Anime & Manga Licenses [Update 12/14]

In this thread, you'll find a comprehensive list of anime and manga licensed in the second quarter (Oct-Dec) of 2020. Fall 2020 anime which were licensed more

Recent Forum Discussion

Possible second season?
tvabsurdist - Dec 17, 2020
38 replies by mariox7777 »»
6 hours ago
Poll: Maoujou de Oyasumi Episode 12 Discussion ( 1 2 3 )
Stark700 - Dec 21, 2020
121 replies by boku_no_pervert »»
Jan 15, 8:30 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