Aria, the daughter of a marquis, remembers that when she was eight years old, she was Saint Esta, one of the four wise men who defeated the Demon King a thousand years ago. She is surprised, but her first thought is, “It would be a waste if I don’t enjoy the things I didn’t get to enjoy in my previous life…!” Esta died a few days after defeating the Demon King. She wants to make up for it in this life. But there is one thing that bothers her. It is the ring that Aria had when she was born. The ring was supposed to have been given to her fiance by the prince, who was once her companion. She doesn’t know why she has it, but she thinks that she should at least return it to the grave.