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Sleepy Princess in the Demon Castle (Japanese: 魔王城でおやすみ, Hepburn: Maōjō de Oyasumi, lit. 'Good Night in the Demon King's Castle') is a Japanese manga series written and illustrated by Kagiji Kumanomata. It has been serialized in Shogakukan's shōnen manga magazine Weekly Shōnen Sunday magazine since May 2016, with its chapters collected in twenty-seven tankōbon volumes as of March 2024. 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 Princess Syalis (スヤリス姫, Suyarisu Hime) Voiced by: Inori Minase (Japanese); Kira Buckland (English) Princess Syalis (full name: Aurora Sya Lis Goodereste) (オーロラ・栖夜・リース・カイミーン, Ōrora Suya Rīsu Kaimīn) 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 four years now. Twilight the Demon King (魔王タソガレ, Maō Tasogare) Voiced by: Yoshitsugu Matsuoka (Japanese); Alejandro Saab (English) Demon Cleric (あくましゅうどうし, Akuma Shūdōshi) Voiced by: Kaito Ishikawa (Japanese); Mike Haimoto (English) Dawner the Hero (勇者アカツキ, Yūsha Akatsuki) Voiced by: Hiro Shimono (Japanese); Nicholas Andrew Louie, Bryn Apprill (young) (English) 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 Sylias 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, "D-Whatsit". Due to Dawner being outgoing and friendly to Princess Syalis, he had always disturbed her slumber, thus causing her to have nightmares whenever she dreams about him. He is also known for his poor sense of direction, which explains why Princess Syalis has been captured for four years. Quilladillo (はりとげマジロ, Hari Toge Majiro) Voiced by: Rikiya Koyama (Japanese); Ben Lepley (English) Frankenzombie (フランケンゾンビ, Furankenzonbi) Voiced by: Kōichi Sōma (Japanese); Jim Foronda (English) Minotaur (ミノタウロス, Minotaurosu) Voiced by: Masashi Yamane (Japanese); Gianni Matragrano (English) Castle Goblin Grunt (やしき手下ゴブリン, Yashiki Teshita Goburin) Voiced by: Shinya Takahashi (Japanese); Ricco Fajardo (English) Great Red Siberian (レッドシベリアン・改, Reddo Shiberian-Kai) Voiced by: Chikahiro Kobayashi (Japanese); J. Michael Tatum (English) 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. Ghost Shroud (おばけふろしき, Obake Furoshiki) Voiced by: Kōichi Sōma (Japanese); Bryce Papenbrook (English) 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. Poseidon (ポセイドン) Voiced by: Takeo Ōtsuka (Japanese); Kevin Thelwell (English) A demon who has dominion over water. Because Poseidon never wears a shirt, the princess labels him a nudist. Fire Venom Dragon (かえんどくりゅう, Kaen doku Ryū) Voiced by: Takaya Kuroda (Japanese); Jason Marnocha (English) Neo Alraune (ネオアルラウネ, Neo Aruraune) Voiced by: Sayaka Ohara (Japanese); Michele Knotz (English) A gentle plant demon, whom has motherly concern for the Princess. While willing to overlook all the deaths the Cleric is forces to undo, Neo Alraune became "miffed" upon she her tree trunk brother killed by the Princess as part of one her usual ridiculous sleep plans. Alazif (アラージフ, Arājifu) Voiced by: Ayane Sakura (Japanese); Suzie Yeung (English) 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, he is left severely disappointed with her due to her preoccupation with sleeping. Scissors Sorcerer (シザーマジシャン, Shizā Majishan) Voiced by: Junichi Suwabe (Japanese); Kyle Igneczi (English) 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. Harpy (ハーピィ, Hāpī) Voiced by: Ayaka Ōhashi (Japanese); Morgan Garrett (English) A harpy who believes that the princess considers her a friend over a misunderstanding with Syalis wishing to nap on Harpy's feathers Hades (ハデス, Hadesu) Voiced by: Kishō Taniyama (Japanese); Christopher Wehkamp (English) Twilight's older brother. Unlike his clumsy brother, Hades the classic embodiment of a Demon King; always looking for chance to usurp the throne if Twilight messes up bad enough. Hypnos (睡魔, Suima) Voiced by: Shin-ichiro Miki (Japanese); Robbie Daymond (English) A sleep demon; he must sleep 20 hours a day or risk death. Hypnos was called to examine Sylas' nightmare at one point; revealing to the demons just how much the process loathes Dawner (the source of the nightmare). Cubey (さっきゅん, Sakkyun) Voiced by: Ari Ozawa (Japanese); Jad Saxton (English) A succubus who looks eerily like the princess; only she has red hair and gold eyes. Cubey wished to learn why the princess was so popular despite looking the same, but got suckered into being trained as her double. Queen Nemlis (カイミーンの女王, Kaimīn no Joō) Voiced by: Saori Hayami (Japanese); Elizabeth Maxwell (English) Nemlis (full name: Aurora Nem Lis Goodereste) (オーロラ・音無（ネム）・リース・カイミーン, Ōrora Nemu Rīsu Kaimīn) is the queen of Goodereste, a kingdom of humankind, and mother of Princess Suyaris. Media Manga Written and illustrated by Kagiji Kumanomata, Sleepy Princess in the Demon Castle started in Shogakukan's shōnen manga magazine Weekly Shōnen Sunday on May 11, 2016. Shogakukan has collected its chapters into individual tankōbon volumes. The first volume was released on September 16, 2016. As of March 18, 2024, twenty-seven 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 composi.... Discover the Kagiji Kumanomata popular books. Find the top 100 most popular Kagiji Kumanomata books.