In the eerie domain of Demon Lord Tasogare, a castle looms, teeming with a myriad of monsters that strike fear into any captive's heart. Yet, amidst this chilling setting, Princess Aurora Suya Rhys, known as 'Syalis,' stands out. Unfazed by her predicament, Syalis harbors a singular obsession—sleep. Since her abduction by the demon lord, rest has eluded her. Resourceful and determined, the princess scours the castle for unconventional sleep aids. From the fur of cuddly demonic bears to the ethereal embrace of ghostly shrouds, she spares no effort to secure a peaceful slumber. Armed with a relentless quest for repose, Syalis ventures into the realm of crafting makeshift bedtime comforts, undeterred even by the specter of death.