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poster of Sleepy Princess in the Demon Castle
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Sleepy Princess in the Demon Castle (2020)

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.

Release Date: Tue, Oct 06, 2020

Country: JP
Language: Ja
Runtime: 24

Inori Minase
Princess Syalis (voice)
Kaito Ishikawa
Demon Cleric (voice)
Yoshitsugu Matsuoka
Demon King Tasogare (voice)
Hiro Shimono
The Hero Akatsuki (voice)
Rikiya Koyama
Majiro the Hedgehog (voice)
Kouichi Souma
Frankenzombie (voice) / Ghost Wrapping Paper (voice)
Junichi Suwabe
Caesar Magician (voice)
Shinya Takahashi
Goblin Serf (voice)
Chikahiro Kobayashi
Red Siberian (voice)
Sayaka Ohara
Harpy (voice)
Ayane Sakura
Aladdif (voice)
Takeo Otsuka
Poseidon (voice)
Masashi Yamane
Minotauro (voice)
Takaya Kuroda
Flame Poison Dragon (voice)
Sayaka Ohara
Neo Alraune (voice)
Shin-ichiro Miki
Hypnos (voice)
Kisho Taniyama
Hades (voice)

Season 1:

Sleepless Princess of the Castle
Episode 1: Sleepless Princess of the Castle (Oct 06, 2020)
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
Episode 2: The Princess and Furious Fluff (Oct 13, 2020)
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
Episode 3: The Princess and Forbidden Knowledge (Oct 20, 2020)
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
Episode 4: The Princess, Destruction, and a Short Journey (Oct 27, 2020)
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
Episode 5: The Princess and Female Warriors (Nov 03, 2020)
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
Episode 6: The Princess’ Unwavering Choice (Nov 10, 2020)
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
Episode 7: Even More Sleepless Princess of the Castle (Nov 17, 2020)
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
Episode 8: The Princess and the Frightful Demon Nightmare (Nov 24, 2020)
Back at the Demon Castle, Princess Syalis interrupts an important meeting to share about her haunted dreams.
The Princess and Hostage Training Week
Episode 9: The Princess and Hostage Training Week (Dec 01, 2020)
It’s time for Princess Syalis to start acting like a proper hostage, so the demon king issues a decree to help change that.
The Princess in Endopolis
Episode 10: The Princess in Endopolis (Dec 08, 2020)
Princes Syalis is determined to get her hands on the latest and greatest sleep product, but it’s only available in the Human Realm.
The Princess and Troubling Dreams
Episode 11: The Princess and Troubling Dreams (Dec 15, 2020)
Princess Syalis feels tired no matter how much sleep she gets, and her troubling dreams aren’t helping.
Sleeping Princess of the Demon Castle
Episode 12: Sleeping Princess of the Demon Castle (Dec 22, 2020)
Despite living as a captive in the Demon Realm, the princess writes a letter to Santa. The letter’s contents shock the demon king.

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