Sleepy Princess in the Demon Castle TV anime started premiering from October 6th 2020. The anime is listed with 12 Episodes, which will be delivered in 3 Blu-ray volumes. The anime also released the Opening and Ending in the Youtube.
Inori Minase performed the opening theme Kaimin! Anmin! Syalist Seikatsu
ORESAMA performed the ending theme Gimmme!
Sleepy Princess in the Demon Castle (Japanese: 魔王城でおやすみ) is a Japanese manga series written and illustrated by Kagiji Kumanomata. The series started publishing in Shogakukan's Weekly Shōnen Sunday magazine in May 2016.
Source: Official Website