魔王城でおやすみ

Princess Syalis is carried off by the Demon King and locked in his castle as leverage against the human kingdom, but captivity bores her far more than it frightens her. Worn out by the demands of royal life, she decides her one goal is a perfect night's sleep, and she raids the castle for bedding materials, picks fights with its monsters and turns the dungeon upside down to get it. Her jailers can only watch their prisoner take the place apart.