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Series

Sleepy Princess in the Demon Castle

2020Unknown runtime8.4 / 101 seasons

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.

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Available in US

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Season guide

Season 1

12 episodes available

Episode 1: Sleepless Princess of the Castle

24m

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.

Episode 2: The Princess and Furious Fluff

24m

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.

Episode 3: The Princess and Forbidden Knowledge

24m

Princess Syalis is on the loose again meddling with forbidden magical items and causing total mayhem for the Demon Castle.

On screen

Cast & Characters

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)

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Episode 4: The Princess, Destruction, and a Short Journey

24m

Fed up with her circumstances at the Demon Castle, Princess Syalis goes to great lengths to add luxuries to her castle prison.

Episode 5: The Princess and Female Warriors

24m

The female unit, long deployed out in the field, has returned to the Demon Castle to get their first taste of Princess Syalis.

Episode 6: The Princess’ Unwavering Choice

24m

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.

Episode 7: Even More Sleepless Princess of the Castle

24m

Princess Syalis wakes to find herself in a completely different castle! What happened and how will she return to the Demon Castle?

Episode 8: The Princess and the Frightful Demon Nightmare

24m

Back at the Demon Castle, Princess Syalis interrupts an important meeting to share about her haunted dreams.

Episode 9: The Princess and Hostage Training Week

24m

It’s time for Princess Syalis to start acting like a proper hostage, so the demon king issues a decree to help change that.

Episode 10: The Princess in Endopolis

24m

Princes Syalis is determined to get her hands on the latest and greatest sleep product, but it’s only available in the Human Realm.

Episode 11: The Princess and Troubling Dreams

24m

Princess Syalis feels tired no matter how much sleep she gets, and her troubling dreams aren’t helping.

Episode 12: Sleeping Princess of the Demon Castle

24m

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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Red Siberian (voice)

Sayaka Ohara

Harpy (voice)

Ayane Sakura

Aladdif (voice)

Takeo Otsuka

Poseidon (voice)