Rozen Maiden AliBat: Record of Rozen War

Jun Sakurada is a hikikomori who has perfected the art of ordering things online and returning them before the charge clears. One day he accepts an offer that arrives through his desk — fill out a form, get a doll. A doll arrives. She introduces herself as Shinku, the fifth Rozen Maiden, and she has a fully formed personality that does not include taking orders from Jun. She enlists him as her energy source via a Rosa Mystica ring, using the connection to fight her six sisters. Each Rozen Maiden was created by the artisan Rozen with one dream: that the perfect girl, "Alice," might exist. Only one of them can survive to become her. They have been fighting toward this outcome for hundreds of years.