Maoujou de Oyasumi
Sleepy Princess in the Demon Castle
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Maoujou de Oyasumi

Alternative Titles

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


Type: Manga
Volumes: Unknown
Chapters: Unknown
Status: Publishing
Published: May 11, 2016 to ?
Genres: Comedy Comedy, Fantasy Fantasy
Theme: Mythology Mythology
Demographic: Shounen Shounen
Serialization: Shounen Sunday
Authors: Kumanomata, Kagiji (Story & Art)


Score: 7.941 (scored by 51515,151 users)
1 indicates a weighted score.
Ranked: #8892
2 based on the top manga page. Please note that 'R18+' titles are excluded.
Popularity: #882
Members: 20,235
Favorites: 537

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In a world where humans and demons coexist, Demon Lord Tasogare holds the human empire's princess, Aurora Suya Rhys Kaymin, hostage. He demands humans to give him absolute rule on the world, but humanity refuses to concede without a fight and sends hero Yuusha Akatsuki to save the captive.

Meanwhile, although unharmed, Suya Rhys spends her time locked up in the demon castle, often feeling lethargic. Even so, she has trouble sleeping due to poor hospitality. The princess then begins her amusing adventures as she tries to make herself comfortable and finally get some sleep.

[Written by MAL Rewrite]


Maoujou de Oyasumi has been published in English as Sleepy Princess in the Demon Castle by VIZ Media under the Shonen Sunday imprint since June 12, 2018. The series has also been simulpub through VIZ Manga.

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Dec 6, 2016
Preliminary (30/? eps)
This is a manga where the captured princess is not the damsel in distress. She does what she likes and will do what ever it takes to achieve a good nights sleep. This usually causes trouble for the demons as they have to clean up the mess she has caused.

What about the hero party coming to her rescue? Does the princess even care? The answer is nope. She just wants to sleep.

Every chapter we are presented with a new revolutionary ingenious idea the princess came up to with enhance the quality of her sleep. This involves the theft of items around the castle ...
Nov 21, 2019
Preliminary (142/? eps)
I'm gonna do my best to review this manga with as little bias as possible...which may be difficult. So what is Sleepy Princess in a Demon Castle about you might ask?'s about a Sleepy Princess in a Demon Castle, what you mean? The name literally sums up the synopsis of this whole series. A Princess get's kidnapped by Demon's, and all she wants to do with her time is...find the most random and idiotic ways to help her get to sleep? Hm, interesting...seems like a synopsis like that would get pretty old after a while...heh, you'd think so anyway, but it doesn't. Let's dive ...
Apr 9, 2020
Preliminary (60/? eps)
This series is a disappointment. Despite being a fantasy comedy which I usually like the narrow concept of sleeping lead the story toward forced and awkward conditions. The repetitive pattern of sleeping gear(which is not much, thus forced 'sleeping gear'), sleeping disturbance, and some unrelated-to-sleep-theme makes the series boring and losing focus.

The overly egoistical princess do not help making the series a better comedy. The relationship between the princess and the other characters (yes monsters and even the hero) is one dimensional. The moment a new character appear, that is the aha moment when you think "this is another victim for the princess". Yes new ...

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Poll: Maoujou de Oyasumi Chapter 355 Discussion
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Dec 22, 2023 9:01 AM
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