Richelle, the daughter of a duke, receives an oracle from a saint and becomes the fiancée of the tyrannical Prince Garsha. However, no matter how much time passed, her saint's power could not be used, and when the daughter of a countess, Maria, who suddenly appeared, demonstrated her saint's power, she also stole Garsha's heart. However, the engagement with Richelle is not canceled, and the days of suffering from the two begin. Richelle, who was innocently decapitated at the age of 18, ended her life at the age of 18, but she went backwards and returned to the age of 10! Richelle swore. She first set out to find her companions...!?