Sleepy Princess in the Demon Castle (2020)
A kidnapped princess skips the distress and goes straight to napping — turning a demon castle into her personal sleep laboratory.
Sleepy Princess in the Demon Castle - Series Information
- Original Title: 魔王城でおやすみ
- First Air Year: 2020
- Last Air Year: 2020
- Type: TV Series
- Genres: Animation, Comedy, Sci-Fi, Fantasy
- Content Rating (US): TV-14
- Number of Seasons: 1
- Number of Episodes: 12
- Status: Ended
- Original Language: Japanese
- Spoken Languages: Japanese
- First Air Date: October 6, 2020 (United States - TV-14), October 6, 2020 (Canada - 14+), October 6, 2020 (France - 12), October 6, 2020 (Australia - M), October 6, 2020 (Brazil - 14), October 6, 2020 (Mexico - B-15), October 6, 2020 (South Korea - 15)
- Networks: TV Tokyo
- Production Companies: Doga Kobo
- Production Countries: Japan
- Alternative Titles: Maōjō de Oyasumi (JP), Sleeping in Devil's Castle (US), Sleepy Princess in the Demon Castle (FR), Сон в замку демона (UA)
Sleepy Princess in the Demon Castle - Plot
Syalis is a princess. A really cute one. When she gets kidnapped by the Demon King as a hostage, she's stuck in a castle full of demons, waiting to be rescued by her knight in shining armor. So what does she do? What any of us would. Take a nap—on a pillow she fashioned from her Teddy Demon guards. Duh.
Sleepy Princess in the Demon Castle - Trailer
See the official trailer and get a taste of Princess Syalis's chaotic, sleep-driven adventures:
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Sleepy Princess in the Demon Castle - Cast & Crew
Main Cast
- Sayaka Ohara
- Inori Minase
- Kaito Ishikawa
- Yoshitsugu Matsuoka
- Hiro Shimono
- Rikiya Koyama
- Kouichi Souma
- Junichi Suwabe
- Shinya Takahashi
- Chikahiro Kobayashi
Writers
- Yoshiko Nakamura
- Michihiro Tsuchiya
Sleepy Princess in the Demon Castle - FAQs
What is Sleepy Princess in the Demon Castle about?
Princess Syalis gets kidnapped by the Demon King and held hostage in his castle — but rather than despair, she dedicates herself entirely to one goal: getting a perfect night's sleep. She raids the castle for materials, terrorizes her demon guards, and causes chaos, all in pursuit of the ultimate nap.
Is Sleepy Princess in the Demon Castle based on a manga?
The anime adapts the manga series of the same name by Kagiji Kumanomata, serialized in Weekly Shōnen Sunday since 2016. The manga is an ongoing comedy that parodies classic fantasy tropes by flipping the damsel-in-distress premise entirely on its head.
Where can I stream Sleepy Princess in the Demon Castle?
The series streams on Crunchyroll, including via the Crunchyroll Amazon Channel. If you prefer to own it, episodes are available for purchase on Amazon Video and the Apple TV Store.
Who voices Princess Syalis in the anime?
Princess Syalis is voiced by Inori Minase, a celebrated voice actress known for her roles in Re:Zero and Is It Wrong to Try to Pick Up Girls in a Dungeon?. Her deadpan, determined delivery perfectly captures Syalis's single-minded obsession with sleep.
Is Sleepy Princess in the Demon Castle worth watching?
For fans of laid-back comedy anime, it's a genuine delight. The show's charm lies in its absurdist premise — a princess who treats a demon castle like a luxury hotel — and its consistent, clever gags. It's lighthearted, fast-paced, and endlessly inventive with its comedic setups.
What anime is similar to Sleepy Princess in the Demon Castle?
If you enjoy its comedic fantasy tone, try Miss Kobayashi's Dragon Maid, Gabriel DropOut, or The Great Jahy Will Not Be Defeated! — all share a similar blend of supernatural settings and slice-of-life humor. The Slime Diaries is another great pick for cozy, low-stakes fantasy comedy.
Who composed the music for Sleepy Princess in the Demon Castle?
The soundtrack was composed by Yukari Hashimoto, a prolific anime composer known for her work on Toradora! and March Comes in Like a Lion. Her score for the series blends whimsical, playful melodies that perfectly complement the show's comedic and cozy atmosphere.
How many episodes does Sleepy Princess in the Demon Castle have?
The main series consists of 12 episodes, which aired during the Fall 2020 anime season. There are also 35 additional special episodes available, making the total catalog a generous treat for fans who can't get enough of Princess Syalis and her sleep-obsessed misadventures.
More About Sleepy Princess in the Demon Castle
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