Sleepy Princess in the Demon Castle manga volume 28 features story and art by Kagiji Kumanomata.

Dreams are coming true at the Demon Castle - though unfortunately only the nightmarish kind! As the castle prepares for a historic meeting of the Demon World's movers and shakers, will they be able to keep the chaos under control? Meanwhile, Zastur's wayward clone is (kinda, sorta) dealt with, the Demon King's (middle school) delinquent desires are made manifest, and the princess rocks some dragons in a battle for the seven (legally distinct) Dragun Balls!