

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…
TV-14 • Animation, Comedy • Series • 2020 • 1 season
Starring: Inori Minase, Kaito Ishikawa, Yoshitsugu Matsuoka

S1 E1 - 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.
Oct 6, 2020 • 24m

S1 E2 - 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.
Oct 13, 2020 • 24m

S1 E3 - 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.
Oct 20, 2020 • 24m

S1 E4 - 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.
Oct 27, 2020 • 24m

S1 E5 - 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.
Nov 3, 2020 • 24m

S1 E6 - 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.
Nov 10, 2020 • 24m

S1 E7 - 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?
Nov 17, 2020 • 24m

S1 E8 - The Princess and the Frightful Demon Nightmare
Back at the Demon Castle, Princess Syalis interrupts an important meeting to share about her haunted dreams.
Nov 24, 2020 • 24m

S1 E9 - The Princess and Hostage Training Week
It’s time for Princess Syalis to start acting like a proper hostage, so the demon king issues a decree to help change that.
Dec 1, 2020 • 24m

S1 E10 - The Princess in Endopolis
Princes Syalis is determined to get her hands on the latest and greatest sleep product, but it’s only available in the Human Realm.
Dec 8, 2020 • 24m

S1 E11 - The Princess and Troubling Dreams
Princess Syalis feels tired no matter how much sleep she gets, and her troubling dreams aren’t helping.
Dec 15, 2020 • 24m

S1 E12 - Sleeping Princess of the Demon Castle
Despite living as a captive in the Demon Realm, the princess writes a letter to Santa. The letter’s contents shock the demon king.
Dec 22, 2020 • 24m
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.
TV-14 • Animation, Comedy • TV Series • 2020
