Sleepy Princess in the Demon Castle, Vol. 1Sleepy Princess in the Demon Castle, Vol. 1 by Kagiji Kumanomata A captured princess just wants a good nights sleep! Shhh Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is bored. She decides to while away the hours by sleeping, but getting a good nights rest turns out to be a lot of work! She begins by fashioning a DIY pillow out of the fur of her Teddy Demon guards and an air mattress from the magical Shield of the Wind.