Aurora Suya Rhys Kaymin
main character
TV
7.8
My TrackerPLANNING
Episode: 0 / 12
My Score:
Anime DetailsFINISHED
Estimated watch time
4h 48m
⚡ 3 days at 5 eps/day
Tags & Tropes
Ojou-sama96%Female Protagonist95%Prison95%Episodic94%Parody92%Kuudere90%Demons90%Slapstick87%Iyashikei84%Cute Girls Doing Cute Things77%
TVFINISHED2020 FALL7.8 / 10 AniList score
Sleepy Princess in the Demon Castle
魔王城でおやすみ• Maou-jou de Oyasumi
Synopsis & Story
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
Watch on YouTubeWhere to Watch Officially
Availability, audio and subtitles vary by region and service.
Featured Cast & Voice Actors
Franchise Universe & Related Entries
Aniphoria guide
Sleepy Princess in the Demon Castle: should you watch it?
At a glance
Sleepy Princess in the Demon Castle has been very well received, with an average AniList score of 78/100.
It ranks #19 highest-rated anime of 2020, and #47 most popular anime of 2020, and #5 highest-rated anime of Fall 2020 on AniList.
At about 4 h 48 min in total, it is a short commitment — a weekend binge.
Best for viewers who enjoy Comedy, Fantasy, Slice of Life — especially ojou-sama, female protagonist, prison, episodic.
Episodes
12 episodes are listed.
Main cast & creators
- Character design
- Ai Kikuchi
- Music
- Yukari Hashimoto
Opening & ending themes
Openings
- OP1“Kaimin! Anmin! Suya Rhyst Seikatsu” by Inori Minase
Endings
- ED1“Gimmme!” by ORESAMA · eps 1-11
Theme data from AnimeThemes.moe.
Sleepy Princess in the Demon Castle FAQ
- How many episodes does Sleepy Princess in the Demon Castle have?
- Sleepy Princess in the Demon Castle has 12 episodes of about 24 minutes each, roughly 4 h 48 min in total.
- How long does it take to watch Sleepy Princess in the Demon Castle?
- About 4 h 48 min back to back. At two episodes a day it takes 6 days; at one hour a day, about 5 days.
- Is Sleepy Princess in the Demon Castle finished?
- Yes. Sleepy Princess in the Demon Castle has finished airing.
- Is there a season 2 of Sleepy Princess in the Demon Castle?
- No sequel is listed for Sleepy Princess in the Demon Castle as of October 2026. You can continue the story in the original manga.
- Is Sleepy Princess in the Demon Castle based on a manga?
- Yes. Sleepy Princess in the Demon Castle adapts the manga.
- Who animated Sleepy Princess in the Demon Castle?
- Sleepy Princess in the Demon Castle was animated by Doga Kobo.
- Who sings the opening of Sleepy Princess in the Demon Castle?
- The opening, "Kaimin! Anmin! Suya Rhyst Seikatsu", is performed by Inori Minase.
- Where can I watch Sleepy Princess in the Demon Castle?
- Sleepy Princess in the Demon Castle is listed on Crunchyroll, Bilibili TV. Availability varies by region — check the streaming links on this page.