Kagiji Kumanomata, the creator of the Sleepy Princess in the Demon Castle manga announced that the anime adaptation of the series will premiere this year.
The arrangement began distributing in Shogakukan’s Weekly Shōnen Sunday magazine in May 2016.
The arrangement began in the 2016 issue #24 of Shogakukan’s Weekly Shōnen Sunday distributed on May 11, 2016. Shogakukan has gathered its individual chapter into twelve tankōbon volumes as of September 2019.
In North America, Viz Media has authorized the arrangement in September 2017. The primary volume was discharged on June 12, 2018.
Viz Media portrays the manga:
“Sshhh! Princess Syalis is trying to get a good night’s sleep. Some shut-eye. Forty winks. Catch some Z’s. Long ago in olden times when people and demons lived together in—well, disharmony, really – a demon king kidnaps a human princess and imprisons her in his castle. Bereft, the princess’s subjects beat their chests in anguish…until a hero arises to spearhead Project Rescue Our Princess! While waiting for her knight in shining armor, what’s an imprisoned princess to do …? Teddy-bear guards with bat wings are all very well, but her dungeon cell is bo-o-o-ring! So, she decides to wile away the long hours by sleeping. Now if only she could get comfortable…and didn’t suffer from insomnia…“