Rozen Maiden 0Rozen Maiden Zero; ローゼンメイデン０-ゼロ-

Rozen Maiden 0 is set in Tokyo during Japan's Taisho Era (1912–26). It follows a clumsy girl named Okiku who moves from the countryside to work in a large western-style mansion in the imperial capital. One day, she discovers a mysterious doll in the mansion's attic.