Maoujou de Oyasumi


Sleepy Princess in the Demon Castle

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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
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Information

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: ParodyParody
Demographic: ShounenShounen
Duration: 23 min. per ep.
Rating: PG-13 - Teens 13 or older

Statistics

Score: 7.951 (scored by 107597107,597 users)
1 indicates a weighted score.
Ranked: #7452
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #1128
Members: 236,122
Favorites: 2,487

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7.95
Ranked #745Popularity #1128Members 236,122
Add to My List
Episodes: /12

Synopsis

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]

Characters & Voice Actors


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Opening Theme

Preview
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"Kaimin! Anmin! Suya Rhyst Seikatsu (快眠!安眠!スヤリスト生活)" by Aurora Suya Rhys Kaymin (Inori Minase)
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Ending Theme

"Gimmme!" by ORESAMA

Episode Videos




Reviews

May 29, 2025
The rewatch value for this is insanely high. Each episode is so comfy to sit through, and this cozy mood is very consistent throughout; nothing felt out of place.

The story is quite simple and straight-forward, and the same can be said for the characters to be honest; this isn't really a detriment to the show, as it is a comedy after all, and the simplistic nature is very much a merit in this case. Each episode can be summed up with the princess trying to achieve the best sleep she can get while causing havoc and mayhem for everyone else in the castle; it ...
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 ...
Aug 13, 2022
Preliminary (11/12 eps)
Warning, this review is coming from a manga reader's perspective so there may be spoilers included but I'll try to refrain from spoiling them as much as possible. Again, read this review at your own risk.

Also, to those who may think the rating is quite harsh (due to it being a 4), this is purely my own opinion when comparing the manga and anime. Yes, the anime has done decently in adapting the manga. However, there are bunch of lapses that prevented me from enjoying the anime completely.

Now, onto the review.

For the most part, the anime has done quite well. It's quite ...

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