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Seasons of Sleepy Princess in the Demon Castle

Sleepy Princess in the Demon Castle currently has 1 season and 12 episodes. Most episodes run for around 24 minutes, which makes the show easy to binge in short bursts. The series is currently marked as "Ended". The most recently aired episode came out in 2020.

Sleepy Princess in the Demon Castle Season 1 • TV Show

Season 1

Are there new episodes of Sleepy Princess in the Demon Castle coming?

Sleepy Princess in the Demon Castle is marked as an ended series, with its final episode airing on December 22, 2020. At this time there are no new seasons or episodes announced, so the release radar for this show is effectively closed unless a revival or spin-off is announced. When the next release does arrive, it is expected to carry the same content rating of TV-14 (US), which can influence when it airs on different providers and platforms.

Watch the official trailers for Sleepy Princess in the Demon Castle

Watch the main official trailer for Sleepy Princess in the Demon Castle in one place. Most of these clips were released around October 2020, capturing the show at its peak marketing push. Use the carousel to sample the show's visual style, story hooks and production quality before you dive into full episodes.

Uploaded in October 2020

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Where to watch Sleepy Princess in the Demon Castle for free?

Sleepy Princess in the Demon Castle is available to stream on SuperFilmz. The series is primarily produced for audiences in Japan, so availability can vary by region. However, you can watch full episodes of Sleepy Princess in the Demon Castle for free on SuperFilmz, with ads.

What is Sleepy Princess in the Demon Castle about?

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. It blends animation, comedy and sci-fi & fantasy elements. The series reflects a distinct Japan style and perspective.

Is Sleepy Princess in the Demon Castle worth watching?

Sleepy Princess in the Demon Castle holds an average rating of 8.3/10 based on 136 or more viewer votes. If you enjoy animation, comedy and sci-fi & fantasy stories, this series is a strong candidate for your watchlist.

Release pattern and schedule for Sleepy Princess in the Demon Castle

Sleepy Princess in the Demon Castle has been releasing episodes between October 2020 and December 2020 across 1 season. So far there are 12 released episodes, giving you plenty of story to catch up on before the next drop.

Cast and creators of Sleepy Princess in the Demon Castle

The main cast includes Inori Minase, Kaito Ishikawa and Yoshitsugu Matsuoka. Behind the scenes, it is directed by Mitsue Yamasaki.

Inori Minase

as Princess Syalis (voice)

Kaito Ishikawa

as Demon Cleric (voice)

Yoshitsugu Matsuoka

as Demon King Tasogare (voice)

Hiro Shimono

as The Hero Akatsuki (voice)

Rikiya Koyama

as Majiro the Hedgehog (voice)

Kouichi Souma

as Frankenzombie (voice) / Ghost Wrapping Paper (voice)

Junichi Suwabe

as Caesar Magician (voice)

Shinya Takahashi

as Goblin Serf (voice)

Chikahiro Kobayashi

as Red Siberian (voice)

Sayaka Ohara

as Harpy (voice)

Ayane Sakura

as Aladdif (voice)

Takeo Otsuka

as Poseidon (voice)

Masashi Yamane

as Minotauro (voice)

Takaya Kuroda

as Flame Poison Dragon (voice)

Sayaka Ohara

as Neo Alraune (voice)

Shin-ichiro Miki

as Hypnos (voice)

Kisho Taniyama

as Hades (voice)

Sleepy Princess in the Demon Castle Keywords(10)

Last Updated

This page was last updated on Sep 1, 2026, 10:29 AM