Sleepy Princess in the Demon Castle

Sleep is the Only Mission. Originally a manga by Kagiji Kumanomata and later a hit anime by Doga Kobo, this series flips the "Damsel in Distress" trope on its head. Instead of waiting to be rescued, Princess Syalis spends her kidnapping "imprisonment" hunting down the high-ranked demons of the castle to use their fur, silk, and horns for better bedding. It is a masterclass in cozy, dark-comedy storytelling.