Locke is the top puppeteer in the demon world. But due to an accident, he lost the woman he loved most. So he vowed to resurrect his lover and worked hard to collect long-lost stories in the human world. The purpose is to convey something from those stories to that doll so that she can become a real human being.
Asa, an ordinary girl, was forced to work in Locke's shop because her parents were in debt. Because she looked exactly the same as Locke's lover, she was happily accepted by Locke, but she learned about Locke by chance. When her dream finally came true, she noticed her feelings, but she faced a difficult choice.