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.
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see all options Availability data: JustWatch
- Seasons
- 1
- Episodes aired
- 12
- Latest aired
- S01E12
- Total runtime
- 4h 48min
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S01E01 Sleepless Princess of the Castle
October 6 · 24min find the promo
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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.
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S01E02 The Princess and Furious Fluff
October 13 · 24min find the promo
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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.
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S01E03 The Princess and Forbidden Knowledge
October 20 · 24min find the promo
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Princess Syalis is on the loose again meddling with forbidden magical items and causing total mayhem for the Demon Castle.
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S01E04 The Princess, Destruction, and a Short Journey
October 27 · 24min find the promo
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Fed up with her circumstances at the Demon Castle, Princess Syalis goes to great lengths to add luxuries to her castle prison.
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S01E05 The Princess and Female Warriors
November 3 · 24min find the promo
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The female unit, long deployed out in the field, has returned to the Demon Castle to get their first taste of Princess Syalis.
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S01E06 The Princess’ Unwavering Choice
November 10 · 24min find the promo
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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.
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S01E07 Even More Sleepless Princess of the Castle
November 17 · 24min find the promo
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Princess Syalis wakes to find herself in a completely different castle! What happened and how will she return to the Demon Castle?
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S01E08 The Princess and the Frightful Demon Nightmare
November 24 · 24min find the promo
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Back at the Demon Castle, Princess Syalis interrupts an important meeting to share about her haunted dreams.
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S01E09 The Princess and Hostage Training Week
December 1 · 24min find the promo
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It’s time for Princess Syalis to start acting like a proper hostage, so the demon king issues a decree to help change that.
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S01E10 The Princess in Endopolis
December 8 · 24min find the promo
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Princes Syalis is determined to get her hands on the latest and greatest sleep product, but it’s only available in the Human Realm.
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S01E11 The Princess and Troubling Dreams
December 15 · 24min find the promo
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Princess Syalis feels tired no matter how much sleep she gets, and her troubling dreams aren’t helping.
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S01E12 Sleeping Princess of the Demon Castle
December 22 · 24min find the promo
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Despite living as a captive in the Demon Realm, the princess writes a letter to Santa. The letter’s contents shock the demon king.