Kodoani.com – Issue 24 of Shogakukan's Weekly Shonen Sunday magazine revealed on Wednesday that the manga Sleepy Princess in the Demon Castle (Maoujou de Oyasumi) by Kagiji Kumanomata will be on hiatus and will return in issue 28 of the magazine in June, with a new arc titled “Mazoku Zentai Kaigi” (Demon Race Congress). The magazine said that the hiatus was for Kumanomata to get a “good night's sleep”.
Viz Media publishes the manga in English and will release the 24th compiled book volume on June 11. Viz Media describes the manga's story as follows:
A captured princess just wants a good night's sleep! Shhh… Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis… is depressed.
Sshhh! Princess Syalis is trying to get a good night's sleep. Some people closed their eyes. Forty blinks. Catch some Z. A long time ago in ancient times when humans and demons lived together – at odds, really – a demon king kidnapped a human princess and imprisoned her in his castle. him. Bereft, the princess's subjects beat their chests in pain…until a hero appears to lead our Princess Rescue Project! While waiting for her knight in shining armor, what will a captive princess do…? The teddy bear guards with bat wings are all very good, but her dungeon cell is an absolute bo-ooo-ring! So she decided to pass the long hours by sleeping. Now if only she could relax… and not lose sleep…
The manga launched in Weekly Shonen Sunday in 2016. Shogakukan published the manga's 27th compilation volume on March 18.
The manga's television anime adaptation premiered in October 2020. Funimation streamed the anime as it aired in Japan.