Having been traumatized by school, Jun Sakurada spends his days as a shut-in at home, buying items online only to return them before the free trial period expires. So when a note appears on his desk asking whether he would wind something, he assumes it is related to an order and carelessly circles "yes," thereby changing his life forever. A box arrives containing a wind-up doll, but this is no ordinary toy: after Jun winds her up, she begins walking and talking like a normal person. With a haughty attitude, she introduces herself as Shinku, the fifth doll in the Rozen Maiden collection, a group of special dolls created by the legendary dollmaker Rozen. These sisters must battle each other in a competition called the Alice Game, with the help of a human to ensure victory. The winner becomes Alice, a real girl worthy of meeting their creator. As more sentient dolls end up taking residence in Jun's house, and a foe from Shinku's past makes her appearance, Jun's life becomes far more complicated than he ever thought possible.