"Rozen Maiden: Ouvertüre" is a two-episode OVA that serves as a prequel to the "Rozen Maiden" series, delving into the backstory of the central conflict between the living dolls and their creator. The narrative focuses on Shinku, the fifth Rozen Maiden doll, and her rival, Suigintou, the first doll. The story explores the origins of their animosity and the events leading up to the Alice Game, a deadly competition orchestrated by their creator, Rozen, to determine the perfect doll worthy of becoming "Alice."

The OVA begins with Suigintou's creation, highlighting her feelings of abandonment and inadequacy when Rozen leaves her unfinished, prioritizing the completion of Shinku. This fuels Suigintou's resentment and desire to prove her worth. Meanwhile, Shinku, embodying grace and elegance, remains unaware of Suigintou's inner turmoil, further deepening the rift between them. The narrative shifts to their first encounter, where Suigintou challenges Shinku to a duel, seeking validation through combat. Their battle is intense, driven by Suigintou's desperation and Shinku's resolve to uphold her creator's ideals.

The story also introduces key supporting characters, including Suiseiseki and Souseiseki, the twin dolls who play pivotal roles in the broader "Rozen Maiden" narrative. The OVA provides insight into the dynamics between the dolls, their individual motivations, and the emotional weight of their existence as creations striving for perfection. The themes of identity, purpose, and the consequences of abandonment are central to the narrative, offering a deeper understanding of the characters' actions in the main series.

"Rozen Maiden: Ouvertüre" effectively bridges the gap between the dolls' origins and the events of the primary storyline, providing context for their relationships and the stakes of the Alice Game. The OVA maintains a focus on character development and emotional depth, enriching the overarching narrative of the "Rozen Maiden" series.