Sleepy princess in the Demon Castle. 3

Kidnapped by the Demon King and imprisoned in his castle, Princess Syalis is ... bored. Winter has come, and Princess Syalis will do anything to stay warm, including creating a DIY magical device (known as a "Ko-tatsu"), knitting woolen underwear and trying to convince the castle blacksmith to make her a window to keep out the drafts. When she accidentally dies yet again - along with Stamper Cat - curious resurrection complications ensue. Then it...