As Jun Sakurada fights and lives alongside the Rozen Maidens, special lifelike dolls created to battle one another, he takes a rare break during the events of Rozen Maiden: Träumend, where he is told a story. When Jun purchases a brooch as a gift for Shinku, the fifth doll, she refuses to accept it under any circumstances. Souseiseki, the fourth doll, then recounts the story of how Shinku and the first doll, Suigintou, first met. This tale describes the cruel and heartbreaking circumstances surrounding Suigintou's birth, and how the many misunderstandings between her and Shinku shaped their longstanding rivalry, fueled by Suigintou's unfettered hate towards Shinku. The setting shifts to Rozen Maiden: Ouvertüre in 19th century London as the story delves into the past of these former friends and the secrets they hold.