This two-episode Rozen Maiden special was aired on December 22 and 23, 2006 on TBS in Japan. It is a brief prequel to the events of the TV series. Ouvertüre (オーベルテューレ, ōberuchiyūre?), German for "overture", is set at some point during Träumend (most likely between episodes six and seven) and answers critical questions about Suigintou's past, particularly those pertaining to the rivalry she holds with Shinku. The majority of the two-episode special is told by Souseiseki and takes place as a flashback to the nineteenth century in London. Ali Project once again lends its talents for the opening song. As with the series, Kukui sings the ending theme.
If you watched the first two seasons of Rozen Maiden and you loved the character suigintou than this OVA will tell you all about her :D....I really enjoyed this anime I can't tell you why because than spoil it XD