Sleepy Princess in the Demon Castle Manga Volume 20 features story and art by Kagiji Kumanomata.
A leaked video from the Demon Castle embarrasses most of its occupants. Agave finally confronts her demons – or rather, the Demon King. Then, when Princess Syalis messes with a magical spinning wheel, it’s Poseidon who takes the hit. To rescue the God of the Sea from the effects of the wheel, she must embark on a deep dive into the history of the spell and… her own family?! Plus, Twilight’s first love revealed! Sort of.