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Sleepy Princess in the Demon Castle 

Maou-jou de Oyasumi (original title)
A princess is kidnapped by a demon king and held prisoner in his castle. But the princess just wants to spend her time either sleeping or causing trouble for the demons.




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Series cast summary:
Inori Minase ...  Princess Syalis Goodrest 12 episodes, 2020
Yoshitsugu Matsuoka Yoshitsugu Matsuoka ...  Demon Lord Tasogare 12 episodes, 2020
Rikiya Koyama ...  Haritoge Majiro / ... 12 episodes, 2020
Saori Hayami ...  Narrator / ... 12 episodes, 2020
Kaito Ishikawa Kaito Ishikawa ...  Demon Cleric 11 episodes, 2020
Chikahiro Kobayashi Chikahiro Kobayashi ...  Great Red Siberian 11 episodes, 2020
Masashi Yamane Masashi Yamane ...  Minotauros / ... 9 episodes, 2020
Koichi Soma Koichi Soma ...  Franken Zombie / ... 9 episodes, 2020
Takeo Otsuka Takeo Otsuka ...  Poseidon 8 episodes, 2020
Sayaka Ôhara Sayaka Ôhara ...  Neo Arlaune 8 episodes, 2020
Hiro Shimono ...  Akatsuki Yusha / ... 6 episodes, 2020


Sshhh. Princess Syalis is trying to get a good night's sleep. Some shut-eye. Forty winks. Catch some Z's. Long ago in olden times when people and demons lived together in well, disharmony really, a demon king kidnaps a human princess and imprisons her in his castle. Bereft, the princess's subjects, beat their chests in anguish until a hero arises to spearhead "Project Rescue Our Princess". While waiting for her knight in shining armor, what's an imprisoned princess to do? Teddy-bear guards with bat wings are all very well, but her dungeon cell is boring. So, she decides to wile away the long hours by sleeping. Now if only she could get comfortable and didn't suffer from insomnia.

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Parents Guide:

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Did You Know?


Princess Syalis's full name, according to the manga comic, is Aurora Syalis Goodreste. These three names all refer to sleeping:
  • Syalis refers to "suyasuya", the Japanese sound effect for a peaceful sleep (the English counterpart is "zzzz")
  • Aurora refers to the Sleeping Beauty (1959) princess
  • and Goodreste is self-explanatory (in Japan the name is "Kaymin", named after "kaimin", the Japanese word for "good rest").
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Music and Arrangement by Hideya Kojima
Lyrics by Pon
Performed by Oresama
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User Reviews

I feel this show on a Spiritual level
18 October 2020 | by aj1218See all my reviews

I know this show is a gimmicky and it is an odd comedy but after the first two episodes I feel the pain of this princess on a spiritual level. The struggle to acquire items to make your sleeping area comfortable is something innate in all humanity and unless you have been in a similar situation you just don't realize. It is campy and goofy but it is full of good laughs. This show reminds me of my first deployment and throughout the course of that deployment me and my guys ended up slowly acquiring items to make our sleeping areas better. That feeling of improving your bed just by a little is still one of the greatest feelings I have ever had, and you too can have that feeling by watching this Princess make her living area even better.

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Official Sites:

Official site [Japan]





Release Date:

2020 (Japan) See more »

Also Known As:

Sleepy Princess in the Demon Castle See more »

Company Credits

Production Co:

Dogakobo See more »
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Technical Specs

Sound Mix:




Aspect Ratio:

16:9 HD
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