Maoujou de Oyasumi is a comedic fantasy anime series that revolves around Princess Syalis, who is held captive in a demon castle. Despite her imprisonment, her main concern is finding a good night's sleep. The series humorously follows her relentless and creative efforts to secure a comfortable rest, often causing chaos within the demon castle. The anime explores themes of persistence and creativity, offering a unique twist on the classic damsel-in-distress narrative.