Chatter is a thief who works in a duo with her childhood friend Rain, whom she grew up with in an orphanage. After a fight with Rain, she goes solo on a job to steal jewels from a mansion, where she falls in love with the duke's son, Delmuth. Boldly, Chatter continues to meet Delmuth while pretending to be a countryside noblewoman, and within a month, they confirm their love and even set a wedding date. However, joy is short-lived as Chatter is suddenly kidnapped the day before the wedding. In an unfamiliar place, the only ones who can rescue her are Rain and Delmuth. Desperate to escape, Chatter writes an unsent letter to the two of them.