Sleepy Princess in the Demon Castle
魔王城でおやすみ
We checked 8 streaming services in India on 06 Jun 2026 at 21:21 IST
About
When young Princess Syalis is kidnapped and imprisoned by the Demon King, she's rather indifferent about her situation. But she quickly comes to a terrible realisation—she can't sleep soundly in such an uncomfortable bed! She soon escapes her cell and sets off in search of ways to improve her sleep quality, leaving the castle's inhabitants, and even the Demon King himself, scrambling to keep the unruly princess out of trouble during her chaotic adventures.
Cast
Inori Minase
as Princess Syalis (voice)
Kaito Ishikawa
as Demon Cleric (voice)
Yoshitsugu Matsuoka
as Demon King Tasogare (voice)
Hiro Shimono
as The Hero Akatsuki (voice)
Rikiya Koyama
as Majiro the Hedgehog (voice)
Kouichi Souma
as Frankenzombie (voice) / Ghost Wrapping Paper (voice)
Junichi Suwabe
as Caesar Magician (voice)
Shinya Takahashi
as Goblin Serf (voice)
Chikahiro Kobayashi
as Red Siberian (voice)
Sayaka Ohara
as Harpy (voice)
Ayane Sakura
as Aladdif (voice)
Takeo Otsuka
as Poseidon (voice)
Masashi Yamane
as Minotauro (voice)
Takaya Kuroda
as Flame Poison Dragon (voice)
Sayaka Ohara
as Neo Alraune (voice)
Shin-ichiro Miki
as Hypnos (voice)
Kisho Taniyama
as Hades (voice)
Episodes
Season 1
Sleepless Princess of the Castle
Princess Syalis is abducted from her home of the Nation of Goodereste by Twilight the Demon King. Despite the horrors lurking in the Demon Castle, all Princess Syalis wants is a good night’s sleep.
The Princess and Furious Fluff
As Dawner the Hero faces perilous obstacles to rescue Princess Syalis, the princess continues to find creative ways to sleep more comfortably at the Demon Castle.
The Princess and Forbidden Knowledge
Princess Syalis is on the loose again meddling with forbidden magical items and causing total mayhem for the Demon Castle.
The Princess, Destruction, and a Short Journey
Fed up with her circumstances at the Demon Castle, Princess Syalis goes to great lengths to add luxuries to her castle prison.
The Princess and Female Warriors
The female unit, long deployed out in the field, has returned to the Demon Castle to get their first taste of Princess Syalis.
The Princess’ Unwavering Choice
Dawner the Hero is having more trouble than expected on his journey to the Demon Castle, so the demon higher ups decide to take some action.
Even More Sleepless Princess of the Castle
Princess Syalis wakes to find herself in a completely different castle! What happened and how will she return to the Demon Castle?
The Princess and the Frightful Demon Nightmare
Back at the Demon Castle, Princess Syalis interrupts an important meeting to share about her haunted dreams.
Where does Sleepy Princess in the Demon Castle rank today?
Sleepy Princess in the Demon Castle is #1410 on the HinFlix Daily Streaming Charts today.
- Highest: #1410
- Top 10: 0 days
- Top 100: 0 days
Watch Sleepy Princess in the Demon Castle Online Free — All Episodes in HD
Looking for a place to watch Sleepy Princess in the Demon Castle online for free? You've landed on the right page. Sleepy Princess in the Demon Castle is a highly acclaimed Japanese animation, comedy, and sci-fi & fantasy series from 2020 that you can stream right now on HinFlix in high quality, no signup required.
About Sleepy Princess in the Demon Castle
When young Princess Syalis is kidnapped and imprisoned by the Demon King, she's rather indifferent about her situation. But she quickly comes to a terrible realisation—she can't sleep soundly in such an uncomfortable bed! She soon escapes her cell and sets off in search of ways to improve her sleep quality, leaving the castle's inhabitants, and even the Demon King himself, scrambling to keep the unruly princess out of trouble during her chaotic adventures. Across 1 season and 12 episodes, originally airing on TV Tokyo.
Sleepy Princess in the Demon Castle Cast and Characters
The cast features Inori Minase (as Princess Syalis (voice)), Kaito Ishikawa (as Demon Cleric (voice)), Yoshitsugu Matsuoka (as Demon King Tasogare (voice)), Hiro Shimono (as The Hero Akatsuki (voice)), and Rikiya Koyama (as Majiro the Hedgehog (voice)). Their performances are a major reason Sleepy Princess in the Demon Castle has built such a passionate audience.
Where to Watch Sleepy Princess in the Demon Castle Online
HinFlix lets you stream Sleepy Princess in the Demon Castle online free, instantly, in HD. There's nothing to install — open the page, hit play, done. Works perfectly on Jio, Airtel, Vi networks across India and on slow mobile data thanks to our adaptive video pipeline.
▶ Watch Sleepy Princess in the Demon Castle NowWhy People Are Watching Sleepy Princess in the Demon Castle
There's a reason Sleepy Princess in the Demon Castle keeps showing up on "must-watch" lists. What makes it work is sharp comedic timing that lands consistently and world-building that respects the audience's intelligence. If you enjoy Japanese storytelling that doesn't follow the same tired beats, this is the kind of show you'll end up recommending to friends.
Frequently Asked Questions about Sleepy Princess in the Demon Castle
Where can I watch Sleepy Princess in the Demon Castle online for free?
You can watch Sleepy Princess in the Demon Castle online free on HinFlix. Just open the page and hit play — no signup, no subscription, full HD streaming on phone, tablet, or desktop.
How many episodes does Sleepy Princess in the Demon Castle have?
Sleepy Princess in the Demon Castle has 12 episodes across 1 season. All episodes are available to stream right here on HinFlix.
Is Sleepy Princess in the Demon Castle good? What's the rating?
Sleepy Princess in the Demon Castle holds a 8.4/10 rating based on 132 reviews — genuinely excellent.
Who is in the cast of Sleepy Princess in the Demon Castle?
The main cast includes Inori Minase, Kaito Ishikawa, Yoshitsugu Matsuoka, and Hiro Shimono, plus a strong supporting ensemble.
Is Sleepy Princess in the Demon Castle available in Japanese?
Yes — Sleepy Princess in the Demon Castle was originally produced in Japanese and that's the version you'll stream here on HinFlix. English subtitles are provided when available.
When was Sleepy Princess in the Demon Castle released?
Sleepy Princess in the Demon Castle first aired in 2020.
Do I need an account to watch Sleepy Princess in the Demon Castle on HinFlix?
No. HinFlix is free and you can watch Sleepy Princess in the Demon Castle without creating an account. Sign-up is optional — only useful if you want a personal Watchlist or to comment on episodes.
Similar Series You Might Like
If you enjoyed Sleepy Princess in the Demon Castle, check out Pokémon: Paldean Winds, Lord of Mysteries, Avatar: The Last Airbender, SPY x FAMILY, and Mortal Kombat: Conquest.
Frequently Asked Questions
Where can I watch Sleepy Princess in the Demon Castle for free?
You can watch Sleepy Princess in the Demon Castle online for free on HinFlix. All 12 episodes across 1 season are available to stream in HD without a subscription, signup, or paywall. Just open the show page and press play.
How many seasons and episodes does Sleepy Princess in the Demon Castle have?
Sleepy Princess in the Demon Castle currently has 1 season and a total of 12 episodes. The series status is "Ended", so the episode count may grow as new seasons are released. You can browse the full episode list on HinFlix and continue watching from where you left off.
What is Sleepy Princess in the Demon Castle about?
When young Princess Syalis is kidnapped and imprisoned by the Demon King, she's rather indifferent about her situation. But she quickly comes to a terrible realisation—she can't sleep soundly in such an uncomfortable bed! She soon escapes her cell and sets off in search of ways to improve her sleep quality, leaving… It belongs to the Animation, Comedy, Sci-Fi & Fantasy genres.
In which language is Sleepy Princess in the Demon Castle originally available?
Sleepy Princess in the Demon Castle was originally produced in JA. On HinFlix the show is available in its original JA audio. Check the player options on the watch page for available subtitle tracks.
When was Sleepy Princess in the Demon Castle first released?
Sleepy Princess in the Demon Castle first premiered on October 6, 2020 (2020). The series has since concluded its run.
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