Volume 1: die Zwillinge 
Rozen Maiden die Zwillinge narrates the twin dolls, Suiseiseki and Souseiseki's past story before the manga's starting events. 
 
Volume 2: Rot Schwarz 
Rozen Maiden Rot Schwarz centers on Shinku and Suigintou's past story in the Oxford of the 19th century.

After enduring cruelty from his classmates, Sakurada Jun shuts himself away, preferring to live in solitude. Just when he thought he’d found peace in seclusion, a mysterious box disrupts his world, revealing the enigmatic Shinku—a living doll from the legendary Rozen Maiden collection. Shinku is beautiful yet demanding, and instantly declares that Jun shall be her new servant. Before he can wrap his head around the unusual events, they’re attacked! With no other options for survival, Jun agrees to a contract with Shinku and witnesses the true nature of her power.
 
Now sworn to Shinku, Jun is pulled into the dangerous world of “The Alice Game,” a deadly battle where only one of the seven Rozen Maiden dolls can emerge as the perfect doll. With danger lurking at every turn and Shinku’s high-maintenance personality to contend with, Jun is about to learn just how intense playing with dolls can be! 
 
(Source: Seven Seas Entertainment)

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