The story takes place in a fictional magical universe. The main focus is on the most powerful demon named Tasogare, who plans to kidnap the beautiful princess Aurora. He successfully accomplishes this, and the girl becomes a captive in a large castle. Aurora longs for sleep and becomes obsessed with the desire to sleep and oversleep as much as possible. But it's not so easy to do. Aurora has to use any means at her disposal to finally fall asleep.