Sleepy Princess in the Demon Castle manga volume 27 features story and art by Kagiji Kumanomata.

Great Red Siberian has gone missing! Is the Demon King's lackadaisical pet parenting responsible for his sudden disappearance, or does the arrival of a mysterious new enemy have something to do with it? Then once that's dealt with, Princess Syalis discovers Twilight is the worst kind of drunk (sad), Alraune struggles to live up to how a trio of young pups sees her (as super rad), and Leo explores how he feels about the Demon Castle's latest body swap (very, very, very bad).