best episodes of Sleepy Princess in the Demon Castle poster

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.

1 Seasons
12 Episodes
Ended
Animation Comedy Sci-Fi & Fantasy
Cast & Characters
episode image Even More Sleepless Princess of the Castle
8.3/10 (49 votes)

#1 Even More Sleepless Princess of the Castle

S1:E7

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

episode image The Princess and Hostage Training Week
8.3/10 (49 votes)

#2 The Princess and Hostage Training Week

S1:E9

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 image Sleeping Princess of the Demon Castle
8.0/10 (43 votes)

#3 Sleeping Princess of the Demon Castle

S1:E12

Despite living as a captive in the Demon Realm, the princess writes a letter to Santa. The letter’s contents shock the demon king.

episode image The Princess in Endopolis
7.9/10 (41 votes)

#4 The Princess in Endopolis

S1:E10

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 image The Princess’ Unwavering Choice
7.8/10 (45 votes)

#5 The Princess’ Unwavering Choice

S1:E6

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 image The Princess and the Frightful Demon Nightmare
7.8/10 (42 votes)

#6 The Princess and the Frightful Demon Nightmare

S1:E8

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

episode image The Princess and Troubling Dreams
7.6/10 (42 votes)

#7 The Princess and Troubling Dreams

S1:E11

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

episode image The Princess and Furious Fluff
7.5/10 (49 votes)

#8 The Princess and Furious Fluff

S1:E2

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 image The Princess and Forbidden Knowledge
7.5/10 (48 votes)

#9 The Princess and Forbidden Knowledge

S1:E3

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

episode image The Princess and Female Warriors
7.5/10 (44 votes)

#10 The Princess and Female Warriors

S1:E5

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

episode image Sleepless Princess of the Castle
7.4/10 (60 votes)

#11 Sleepless Princess of the Castle

S1:E1

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 image The Princess, Destruction, and a Short Journey
7.4/10 (46 votes)

#12 The Princess, Destruction, and a Short Journey

S1:E4

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

Cast & Chracters

character image Princess Syalis (voice)

Princess Syalis (voice)

Actor: Inori Minase
character image Demon Cleric (voice)

Demon Cleric (voice)

Actor: Kaito Ishikawa
character image Demon King Tasogare (voice)

Demon King Tasogare (voice)

Actor: Yoshitsugu Matsuoka
character image The Hero Akatsuki (voice)

The Hero Akatsuki (voice)

Actor: Hiro Shimono
character image Majiro the Hedgehog (voice)

Majiro the Hedgehog (voice)

Actor: Rikiya Koyama
character image Frankenzombie (voice) / Ghost Wrapping Paper (voice)

Frankenzombie (voice) / Ghost Wrapping Paper (voice)

Actor: Kouichi Souma
character image Caesar Magician (voice)

Caesar Magician (voice)

Actor: Junichi Suwabe
character image Goblin Serf (voice)

Goblin Serf (voice)

Actor: Shinya Takahashi
character image Red Siberian (voice)

Red Siberian (voice)

Actor: Chikahiro Kobayashi
character image Harpy (voice)

Harpy (voice)

Actor: Sayaka Ohara
character image Aladdif (voice)

Aladdif (voice)

Actor: Ayane Sakura
character image Poseidon (voice)

Poseidon (voice)

Actor: Takeo Otsuka
character image Minotauro (voice)

Minotauro (voice)

Actor: Masashi Yamane
character image Flame Poison Dragon (voice)

Flame Poison Dragon (voice)

Actor: Takaya Kuroda
character image Hypnos (voice)

Hypnos (voice)

Actor: Shin-ichiro Miki
character image Hades (voice)

Hades (voice)

Actor: Kisho Taniyama

The highest rated episode of Sleepy Princess in the Demon Castle is "Even More Sleepless Princess of the Castle" (S1E7) with a rating of 8.30.

This episode received 49 votes.


The lowest rated episode is "Sleepless Princess of the Castle" (S1E1) with a rating of 7.40.

This episode received 60 votes.

The highest rated episode is "Even More Sleepless Princess of the Castle" (S1E7) with a rating of 8.30.

This episode received 49 votes.


The lowest rated episode is "Sleepless Princess of the Castle" (S1E1) with a rating of 7.40.

This episode received 60 votes.

Name Department Job
Chieko Nakamura Art Art Direction
Megumi Matsumoto Art Prop Designer
Takafumi Kuwano Art Graphic Designer
Kunihiko Ito Camera Director of Photography
Mitsue Yamasaki Directing Series Director
Mutsumi Takemiya Editing Editor
Daijiro Morita Production Producer
Yuika Shiraishi Sound Sound Effects
Ai Kikuchi Visual Effects Character Designer
Kei Ishiguro Visual Effects Color Designer
Seiichi Sugiura Visual Effects Visual Effects
Yoshiko Nakamura Writing Series Composition

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