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Sleepy Princess in the Demon Castle
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 30 tankōbon volumes as of August 2025. An anime television series adaptation produced by Doga Kobo aired from October to December 2020.
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.
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 August 18, 2025, 30 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.
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, AT-X, and BS TV Tokyo. Inori Minase performed the opening theme "Kaimin! Anmin! Syalist Seikatsu" (快眠！安眠！スヤリスト生活; "Sleep! A Good Night's Sleep! Syalist Life"), while ORESAMA performed the ending theme "Gimmme!".
Funimation acquired the series and streamed it on its website in North America and the British Isles. On February 21, 2021, Funimation announced the series would receive an English dub, with the first episode premiering the next day. Following Sony's acquisition of Crunchyroll, the series was moved to Crunchyroll. In Southeast Asia and South Asia, the anime is licensed by Muse Communication, and released on Bilibili in Southeast Asia. The series premiered on Animax Asia on May 12, 2021.
In 2017, the series was ranked 16th at the third Next Manga Awards in the print category.
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Sleepy Princess in the Demon Castle
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 30 tankōbon volumes as of August 2025. An anime television series adaptation produced by Doga Kobo aired from October to December 2020.
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.
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 August 18, 2025, 30 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.
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, AT-X, and BS TV Tokyo. Inori Minase performed the opening theme "Kaimin! Anmin! Syalist Seikatsu" (快眠！安眠！スヤリスト生活; "Sleep! A Good Night's Sleep! Syalist Life"), while ORESAMA performed the ending theme "Gimmme!".
Funimation acquired the series and streamed it on its website in North America and the British Isles. On February 21, 2021, Funimation announced the series would receive an English dub, with the first episode premiering the next day. Following Sony's acquisition of Crunchyroll, the series was moved to Crunchyroll. In Southeast Asia and South Asia, the anime is licensed by Muse Communication, and released on Bilibili in Southeast Asia. The series premiered on Animax Asia on May 12, 2021.
In 2017, the series was ranked 16th at the third Next Manga Awards in the print category.