Sleepy Princess In The Demon Castle

is a Japanese manga series written and illustrated by Kagiji Kumanomata. It has been serialized in Shogakukan's manga magazine ''Weekly Shōnen Sunday'' magazine since May 2016, with its chapters collected in twenty-nine volumes as of February 2025. An anime television series adaptation produced by Doga Kobo aired from October to December 2020.

Plot

The story follows Princess Syalis, a young princess who was kidnapped by the Demon King, and her quest to sleep well while imprisoned. Despite the Demon King's best attempts, the princess turns her kidnapping into a vacation; having grown tired with the stress of a royal life, she is indifferent to the situation.

Characters

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:Princess Syalis is a princess who was kidnapped by the demon king and causes chaos in the demon castle while trying to get a good night's sleep. She has been living at the demon king's castle for a year now due to her wishing to escape the stresses of royal life and making no intention to escape. Before long, she begins accepting the demon castle as her new home.
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:The leader of the demon race, who is also the one responsible for abducting Syalis. He is usually annoyed by her antics and sometimes get dragged into them. Despite being the Demon Lord, he's not all that intimidating or ruthless.
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:A demon priest who has the power to bring those who were killed back to life. Most of the time, he had to revive Syalis after she accidentally kills herself or those that she killed for her own means. Like Twilight, he also sometimes gets dragged into Syalis's antics. He seems to have feelings for Syalis as he gets very jealous when anyone else has feelings for her.
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:Dawner is the hero who is entrusted by the Human Confederation of Goodereste with the task of saving Princess Syalis from the demon castle. Although Dawner and Princess Syalis are childhood friends and also engaged, she does not remember who he is. Whenever she mentions Dawner to the denizens of the demon castle, she calls him, "Daw-What's-His-Name". Due to Dawner being outgoing and friendly to Princess Syalis, yet being incredibly clumsy and prone to mistakes, he had always annoyed her, thus causing her to have nightmares when at one point he enters her dreams. He is also known for his poor sense of direction, which explains why Princess Syalis has been captured for a year, along with Syalis' unwillingness to escape.
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:One of Twilight's henchmen. He resembles a porcupine.
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:One of Twilight's henchmen. He resembles Frankenstein.
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:One of Twilight's henchmen.
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:One of Twilight's henchmen.
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:Loyal retainer to the Demon Lord, in charge of enforcing rules. The princess drives him batty by her blatant disregard to the fact she's supposed to be a '' hostage''. In fact, later in the series, he notes that Princess is costing them a fortune with all her misadventures; adding onto the woe everyone endures.
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:He and his subordinates are the principal victims of Princess Syralis's antics, especially when she needs cloth to make things to get a good sleep. The death of the Ghost Shrouds by the Princess is a common joke in the series.
;Ghost Shrouds
:Monster Shroud's minions.
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:A demon who has dominion over water. Because Poseidon never wears a shirt, the princess labels him a nudist.
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:A demon who has dominion over fire. He always wears a mask.
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:A gentle plant demon, whom has motherly concern for the Princess. While willing to overlook all the deaths the Cleric is forced to undo, Neo Alraune became "miffed" upon realizing her tree trunk brother killed by the Princess as part of one her usual ridiculous sleep plans.
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:Spirit of a forbidden grimoire the princess freed by sheer dumb luck. Alazif tries encouraging Syalis to use his powers to defeat the demons and leave the castle; however, she is left severely disappointed with her due to her preoccupation with sleeping.
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: A demon with an arm made of scissors. Syalis gave him her crown to keep his arm together in exchange for his lost scissors; unfortunately, leading to her routine of killing the ghost shrouds.
;Gearbolt
:A scientist demon.
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:A harpy who believes that the princess considers her a friend over a misunderstanding with Syalis wishing to nap on Harpy's feathers.
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:Poseidon's older brother. Hades is always looking for chance to usurp the throne if Twilight messes up bad enough because of their mutual grudge.
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:A sleep demon; he must sleep 20 hours a day or risk death. Hypnos was called to examine Syalis' nightmare at one point; revealing to the demons just how much the princess detests Dawner (the source of the nightmare).
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:A succubus who looks eerily like the princess; only she has purple hair and gold eyes. Cubey wished to learn why the princess was so popular despite looking the same, but got sucked into being trained as her double.
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:Nemlis is the queen of Goodereste, a kingdom of humankind, and mother of Princess Syalis.
;Teddy Demons
:Living teddy bears with wings. Syalis keeps one as a pet and bribes them into giving her the keys to her cell in exchange for being brushed. They soon develop a good relationship with her.
;Morgan
:A muscular paladin who works in Goodereste's castle.
;Evening Star
:A paladin who works in Goodereste's castle. He is only awake at night and falls asleep when its daytime.
;Ker, Ber, and Ros
:Hades' subordinates. They are a trio of wolf demons.
;Tire Genie
:A demon whose body is made of tires. Should his body be missing, he appears in gaseous form.
;Ice Golem
:A demon made of ice cubes. He is the leader of the ice demons.
;Neo Alraune's older brother.
:Neo's unnamed older brother who is a demon that resembles a tree stump. Even when his body is cut up, he does not die so easily.

Media

Manga

Written and illustrated by Kagiji Kumanomata, ''Sleepy Princess in the Demon Castle'' started in Shogakukan's manga magazine ''Weekly Shōnen Sunday'' on May 11, 2016. Shogakukan has collected its chapters into individual volumes. The first volume was released on September 16, 2016. As of February 18, 2025, twenty-nine volumes have been released.

Viz Media announced in September 2017 that they had licensed the series in North America. The first volume was released on June 12, 2018. On May 9, 2023, Viz Media launched their ''Viz Manga'' digital manga service, with the series' chapters receiving simultaneous English publication in North America as they are released in Japan.

An official fanbook of the series was released on October 16, 2020.

Volumes

Anime

An anime television series adaptation was announced in ''Weekly Shōnen Sunday'' in September 2019. The series was animated by Doga Kobo and directed by Mitsue Yamazaki, with Yoshiko Nakamura handling series composition and Ai Kikuchi designing the characters. Yukari Hashimoto composed the series' music. The series ran for 12 episodes from October 6 to December 22, 2020, on TV Tokyo

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