Rozen Maiden Vol 7

From the Tokyopop edition

The Seventh Doll brings about the demise of Hinaichigo before Shinku can save her, but Hinaichigo's Rosa Mystica manages to find its way to Shinku. The Seventh Doll then appears before Suiguintoh and requests Meg in exchange for all the sisters' Rosa Mystica. Could it be that the Seventh Doll desires physical existence? What is the common link between Meg and Suiguintoh? Jun suddenly finds himself rich, and what happened to Souseiseki? Find out what happens in the last volume of Rozen Maiden!

Source: Anime News Network Encyclopedia