Sleepy Princess in the Demon Castle, Vol. 4, Paperback/Kagiji Kumanomata

A captured princess just wants a good night's sleep Shhh... Imprisoned in the castle of the Demon King, all spoiled-sweet Princess Syalis dreams of is a good night's sleep Shhh... Valentine's Day arrives, and Princess Syalis is hard put to get the haul of chocolate she's accustomed to receiving back home in her kingdom. Her latest plots to get a better night's rest include learning to hibernate, becoming a ghost and getting an annoying earworm out of her head. Now how can she put a stop to the Teddy Demons summoning her every time they get into a kerfluffle...? Then the princess gets kidnapped from her kidnappers