"Jun Sakurada receives a doll which, after being wound, comes alive. He becomes Shinku's "medium", a human host that provides the doll with his own life energy, allowing her to walk and use magic. They must participate in the "Alice Game", a competition between the Rozen Maiden dolls. The doll who wins the Alice Game will become a girl of utmost beauty named "Alice", just as their creator Rozen wanted." -- iTunes Store
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Jun Sakurada has decided to isolate himself from the outside world. For fun, he orders items online, only to return them for a refund. One day, he receives a paper, asking whether or not to wind. After Jun carelessly accepts, a mysterious box appears with a doll inside. This doll, being able to move and talk, introduces herself as Shinku, the fifth doll of the Rozen Maiden. Jun enters a contract with Shinku, becoming her medium.
the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.