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Sleepy Princess in the Demon Castle poster
TV Series Finished Fall 2020

Sleepy Princess in the Demon Castle

Maou-jou de Oyasumi · 魔王城でおやすみ

Comedy Fantasy Slice of Life
★ 7.8AniList score
12Episodes
24 minPer episode
Doga KoboStudio
MangaSource

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… Read more

Storyline

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)

Trailer

Characters & Japanese Voice Cast

Aurora Suya Rhys Kaymin Aurora Suya Rhys Kaymin Main VA: Inori Minase
Maou Tasogare Maou Tasogare Supporting VA: Yoshitsugu Matsuoka
Akuma Shuudoushi Akuma Shuudoushi Supporting VA: Kaito Ishikawa
Debi Akuma Debi Akuma Supporting
Sakkyun Sakkyun Supporting VA: Ari Ozawa
Red Siberian Kai Red Siberian Kai Supporting VA: Chikahiro Kobayashi
Harpy Harpy Supporting VA: Ayaka Oohashi
Neo Alraune Neo Alraune Supporting VA: Sayaka Oohara
Nasu Azarashi Nasu Azarashi Supporting
Suima Suima Supporting VA: Shinichirou Miki
Haritoge Majiro Haritoge Majiro Supporting VA: Rikiya Koyama
Scissor Magician Scissor Magician Supporting VA: Junichi Suwabe

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Frequently Asked Questions

How many episodes does Sleepy Princess in the Demon Castle have?

Sleepy Princess in the Demon Castle has 12 episodes.

Which studio made Sleepy Princess in the Demon Castle?

Sleepy Princess in the Demon Castle is produced by Doga Kobo.

Facts from AniList (also listed on MyAnimeList); streaming availability from JustWatch India. Last updated 1 November 2026, 12:37 PM IST. Episode times are Japan broadcast times shown in IST. Spotted a mistake? Write to [email protected].