The latest issue of Shogakukan’s Weekly Shonen Sunday (#42, 2019) announced that Kagiji Kumanomata’s Sleepy Princess in the Demon Castle manga will get an anime TV series. As of press time, no further details have been announced.
Kagiji Kumanomata’s Sleepy Princess in the Demon Castle manga launched in the pages of Weekly Shonen Sunday on May 11, 2016. The ongoing series currently spans eleven volumes, with volume 12 slated to hit Japanese stores on September 18.
Viz Media currently holds the rights to the title, which they describe as:
A captured princess just wants a good night’s sleep!
Imprisoned in the castle of the Demon King, all that spoiled-sweet Princess Syalis dreams of is a good night’s sleep! Shhh… Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is…bored. She decides to while away the hours by sleeping, but getting a good night’s rest turns out to be a lot of work! She begins by fashioning a DIY pillow out of the fur of her Teddy demon guards and an “air mattress” from the magical Shield of the Wielder of the Wind. The princess’s hapless demonic guards soon discover that their captive expects to be treated like, well, a princess. Things go from to bad to worse—for her captors—when some of Princess Syalis’s schemes end in her untimely—if temporary—demise and she chooses the Forbidden Grimoire for her bedtime reading…
Source: Comic Natalie